Principal Voices

Sowing the seas

Atmospheric physicist Carl Hodges founded the Seawater Foundation in 1977 in an attempt to alleviate some of the world's most complex ecological problems. Hodges' unique approach draws seawater inland, irrigating otherwise barren coastal desert regions and turning them green.

Stabilizing the Earth's climate

CNN's Sara Sidner talks to Nobel Prize Winner, Rajendra Pachauri about the challenges of Global Warming.

updated Tue Jan 06 2009 06:49:41

Sowing the seas

Atmospheric physicist Carl Hodges founded the Seawater Foundation in 1977 in an attempt to alleviate some of the world's most complex ecological problems. Hodges' unique approach draws seawater inland, irrigating otherwise barren coastal desert regions and turning them green.

updated Tue Jan 06 2009 06:48:42

Sim Van der Ryn - Pioneer of green architecture

Sim Van der Ryn has been a leader in sustainable architecture for over 40 years. As well as creating a portfolio of inspiring green designs -- notably the 1977 Bateson Building in Sacramento -- he is also a teacher and an author. His most recent book "Design for Life" traces his ancestral and ecological design roots. Principal Voices talked to Van der Ryn about the passion which continues to consume his life.

updated Tue Jan 06 2009 06:47:03

It's a small world

For most of the year, their work is concealed from public view at the end of powerful microscopes.

updated Tue Jan 06 2009 06:46:18

New nano coating boosts solar efficiency

Researchers have developed a new anti-reflective coating that boosts the efficiency of solar panels and allows sunlight to be absorbed from almost any angle.

updated Tue Jan 06 2009 06:45:39

Sizing up the Earth

It is being billed as the ultimate book about the world and it is something of a landmark in its own right. "Earth" -- the biggest atlas ever to be published -- promises to be a luxurious benchmark in cartography.

updated Tue Jan 06 2009 06:44:18

Chicago debate: Facing up to the challenges of climate change

Tackling climate change and its consequences is the challenge of our generation.

updated Tue Jan 06 2009 06:43:38

Data pins polar warming blame on humans

Scientists think they have uncovered conclusive proof that human activity is responsible for rising temperatures in both polar regions.

updated Tue Jan 06 2009 06:41:15

Valuing the rainforests

It is a familiar refrain to hear the earth and its resources being described as precious and that climate change is, and will, prove extremely costly.

updated Tue Jan 06 2009 06:40:12

Briefing: Nuclear power

Of all the power supplies in the energy mix, nuclear has historically been the most criticized and controversial. But this most unpopular of power sources has recently resurfaced in political and economic dialogue.

updated Tue Jan 06 2009 06:39:27

Nuclear NRG

David Crane is a man who isn't afraid of a challenge. When he took the helm at NRG Energy in the winter of 2003, the company was mired in Chapter 11 bankruptcy proceedings -- just one of many companies caught in the meltdown of the U.S. power generation industry, instigated by the scandalous collapse of Texan power giant Enron in 2001.

updated Tue Jan 06 2009 06:38:45

Chip pan rally

Later this summer, a motor rally will make its way across Europe. Nothing strange in that you might think. But this is a race with a difference -- a "banger rally" if you like -- and one with a well-tuned environmental message.

updated Tue Jan 06 2009 06:37:09

Burning down the house

If climate change were a small house fire, current policy in the European Union and the United Kingdom would ensure that it would destroy not just the house but the entire suburb.

updated Tue Jan 06 2009 06:35:40

Organic by design

As a product designer, Agustin Otegui's has to "think big" about the objects he creates. From novel portable chairs made out of shovels to chrome radiators that look like modern works of art, he recasts the mundane in a modernist and functional new light.

updated Tue Jan 06 2009 06:34:34

An upturn for London's upturned table?

Plans to rejuvenate a dilapidated London icon -- known worldwide to movie and music fans -- were unveiled last week.

updated Tue Jan 06 2009 06:33:54

Energy, the smarter way

Whilst the energy grids we rely on to provide us with cheap and reliable electricity may have been fit for purpose in the 20th century, it is now abundantly clear that the design of 21st century energy networks will have to be very different. In Europe, the foundations for a secure, flexible and more energy efficient future are already being laid.

updated Tue Jan 06 2009 06:33:04

Making poverty history

Oxfam's new book "From Poverty to Power: How Active Citizens and Effective States Can Change the World" is a detailed and vivid account of poverty, its effects and how it can be eradicated. Principal Voices spoke to the book's author and Head of Research at Oxfam GB, Duncan Green about the charity's prescription for change.

updated Tue Jan 06 2009 06:29:40

The ultimate in recycling

As far as modes of transport go, it has to be one of the most environmentally friendly: a cardboard bike that can be recycled, in all senses of the word.

updated Tue Jan 06 2009 06:28:24

China's new great wall

Forget the "Bird's Nest" and the "Water Cube". If you're traveling to China this summer, or even if you are watching the Olympics on television, make sure you look out for a glittering new landmark structure in Beijing.

updated Mon Jan 05 2009 11:01:16

The floating ecopolis

The concept may be radical, but it might just have to be if the worst predictions of climate change are realized.

updated Mon Jan 05 2009 11:00:21

Quotes of the day: Peter Head

Director of Arup, Peter Head is leading the company's new department of Planning and Integrated Urbanism.

updated Mon Jan 05 2009 10:59:40

Quotes of the day: Cameron Sinclair

Co-founder and executive director of Architecture for Humanity, Cameron Sinclair opened the second Principal Voices debate on Design for Good by outlining just what the term means to him, but also what it means to the communities his design solutions are aimed at.

updated Mon Jan 05 2009 10:58:47

Water fresh from the tarp

It may look like an air mattress you might see lying around next to a swimming pool but in reality its function couldn't be less trivial.

updated Mon Jan 05 2009 10:57:52

It's not easy being green

You might want to go green, but how do you know what you're buying is truly ethical? Greenwash -- the ignoble art of misleading consumers about a product's true green worth -- is on the rise. But thanks to the work of increasingly vigilant regulators, some of the more curious and downright spurious claims are being weeded out.

updated Mon Jan 05 2009 10:56:52

Climate campers pitch tents to protest 'insanity'

The site has been secured, the tents pitched, banners raised and, most importantly, compost loos installed; there is little to do now but wait for thousands of campers to arrive for one of Britain's biggest environmental protests this year.

updated Mon Jan 05 2009 10:56:25

Grass is greener in biofuel future

Researchers in the United States are buoyed by the results of a study which has determined that a giant grass could help the country to meet its steep biofuel targets.

updated Mon Jan 05 2009 10:55:47

Carbon capture and storage: how does it work?

If there was a most wanted list for climate change culprits, coal-fired power stations would be number one.

updated Mon Jan 05 2009 10:55:07

Capture solar power with your curtains

Imagine every time you closed your curtains, you were capturing enough solar energy to power your laptop. The technology is available, but no one's packaged it up in a handy DIY kit at your local hardware store.

updated Mon Jan 05 2009 10:54:24

The funny side of global warming and jihad

Global warming and the state of the planet aren't exactly laughing matters, but for comedian Abie Philbin Bowman, the dire environmental outlook has at least one bright side.

updated Mon Jan 05 2009 10:53:41

Fueling cars with waste

Imagine if cars ran on household waste, if gas tanks were filled with ethanol made from wood chips. Well, the technology to make it happen is already a reality and companies are now racing to bring this kind of fuel to a gas pump near you.

updated Mon Jan 05 2009 10:52:49

The smart money's on green

Despite taking a beating from the credit crunch, the clean energy sector is being tipped as a golden opportunity for investors.

updated Mon Jan 05 2009 10:52:08

Study: Organic food not more nutritional

If you've ever found yourself in your local supermarket agonizing about whether the organic apples will be a more nutritional and greener choice than the cheaper non-organic ones, you're probably not alone.

updated Mon Jan 05 2009 10:51:22

Climate chief warns against 'tragic' inaction

The head of the Intergovernmental Panel on Climate Change has described as "tragic" the lack of action on climate change by developed countries.

updated Mon Jan 05 2009 10:49:45

Trading the carbon market

Debate is rife in Australian political circles about whether carbon trading is the way forward for climate change abatement.

updated Mon Jan 05 2009 10:46:41

Engineering a hurricane-proof roof

The fears that Hurricane Gustav would turn into another human catastrophe on the scale of Katrina in 2005 have mercifully not been realized.

updated Mon Jan 05 2009 10:45:47

Cleaner coal stokes green debate

Twenty four hours before the greatest scientific experiment of our time gets underway at CERN's Large Hadron Collider, political and scientific dignitaries assembled at a site a few hundred miles north east of the French/Swiss border at a site in Germany to inaugurate another groundbreaking engineering test.

updated Mon Jan 05 2009 10:45:07

Airplane hostel prepares for lift-off

The creators are billing it as one of the coolest hostels in the world and it's undoubtedly one of the most novel overnight stays you are ever likely to experience. Welcome to the Jumbo Hostel -- an old Boeing 747 which is being converted into a 25-room hostel at the Stockholm-Arlanda airport.

updated Mon Jan 05 2009 10:44:04

A new era for wave energy

The renewable energy sector has received a boost with the inauguration of the world's first commercial wave power project off the Portuguese coast.

updated Mon Jan 05 2009 10:43:15

Celebrities embark on climate change voyage

If the craggy, icy west coast of Greenland doesn't inspire them, perhaps Vanessa Carlton's vodka infusions will.

updated Mon Jan 05 2009 10:42:18

Gore calls for coal plant protests

Former vice president and environmental campaigner Al Gore has urged young people to protest against new coal-fired power plants that don't use carbon capture and storage technology.

updated Mon Jan 05 2009 10:40:47

Keeping track of climate change

It can often seem like hard work keeping track of the changes happening to our planet. Another day, another new prediction. Another week, another warning. It's enough to make even the most conscientious climate change student issue a weary discombobulated sigh.

updated Mon Jan 05 2009 10:39:18

Report urges fuel revolution

The International Energy Agency has called for a global energy revolution to ensure future supplies and to stem the rise of greenhouse gas emissions.

updated Mon Jan 05 2009 10:37:30

From landfill to landscape

A landscape restoration of a rubbish dump has won the Energy, Waste and Recycling category at the 2008 World Architecture Festival in Barcelona, Spain.

updated Mon Jan 05 2009 10:36:41

Images of China win new photo award

The inaugural Prix Pictet photography award has been won by Canadian Benoit Aquin for his series of images depicting desertification in China entitled "The Chinese Dust Bowl".

updated Mon Jan 05 2009 10:35:45

Sunshine and air: the gas of the future?

Hydrogen and electric vehicles might be leading the charge, so to speak, towards cleaner transport, but will cars powered by air and the sun ever surpass the sales figures of gasoline cars?

updated Mon Jan 05 2009 10:06:17

Turning carbon dioxide into fuel

You might have thought that recycling is limited to paper, plastics and glass. Well, think again. A Californian company is developing a new technique for recycling carbon dioxide, or CO2, and turning it back into fuel.

updated Mon Jan 05 2009 08:30:07

Learning to be greener

David Hales is president of the College of the Atlantic, a U.S. college with an ecologically-centered approach.

updated Mon Jan 05 2009 08:28:36

Making good energy better

Juliet Davenport is the Oxford University-educated chief executive and founder of Good Energy, a 100 percent renewable electricity supplier in the UK. When she participated in the Principal Voices project in 2007, she talked about the need to embrace renewable energy.

updated Mon Jan 05 2009 08:24:19

Climate change: Debating solutions

Fish tanks, financial markets and the future of the world's climate came together at the third Principal Voices debate of 2008 in Chicago.

updated Mon Jan 05 2009 08:23:31

Still fighting 30 years on

Professor Wangari Maathai was the 2004 Nobel Peace Prize winner and founder of the Green Belt Foundation, a Kenyan environmental organization.

updated Mon Jan 05 2009 08:22:29

New nano coating boosts solar efficiency

Researchers have developed a new anti-reflective coating that boosts the efficiency of solar panels and allows sunlight to be absorbed from almost any angle.

updated Mon Jan 05 2009 08:21:33

Virtuous cycles

New technology devised by a Connecticut firm, The Green Revolution Inc is turning sessions at the gym into clean renewable electricity.

updated Mon Jan 05 2009 08:20:29

Can 'small wind' reap big rewards?

Micro wind turbines are beginning to pop up all over our urban and rural landscapes. But is it worth investing your hard-earned cash in your very own wind machine? In short, it depends. Take a look at our quick guide to see if "small wind" could help you reduce your energy bills and your carbon footprint.

updated Mon Jan 05 2009 08:19:20

Report urges fuel revolution

The International Energy Agency has called for a global energy revolution to ensure future supplies and to stem the rise of greenhouse gas emissions.

updated Mon Jan 05 2009 08:18:19

Mapping out a new world order

As familiar and reassuring as the map of the world is, there is only so much that physical geography can tell us about the state of the planet.

updated Mon Jan 05 2009 08:17:26

The cars of the future are here now

For a century the gasoline engine has remained largely unchallenged, seeing off all pretenders to its crown. But with concerns about greenhouse gas emissions and a host of new contenders looming large in the rear view mirror, is the gasoline-fueled automobile due to be overtaken by a fleet of cleaner, leaner rivals?

updated Mon Jan 05 2009 08:16:43

Sculptor creates treehouse-like tent

It is probably the most unusual tent you'll ever see.

updated Mon Jan 05 2009 08:15:43

Soil study hints at climate model revision

A new study investigating the amount of carbon in Australian soil has cast doubt over the accuracy of current climate models in predicting future levels of global warming.

updated Mon Jan 05 2009 08:14:57

Carbon dioxide levels already a danger

A team of international scientists led by Dr James Hansen, director of NASA's Goddard Institute for Space Studies, say that carbon dioxide (CO2) levels are already in the danger zone.

updated Mon Jan 05 2009 04:57:13

Singapore: Debate highlights

In the stylishly minimal surroundings of Singapore's Red Dot design museum, architect and innovative-thinker Cameron Sinclair opened the second Principal Voices debate of 2008 with a clear statement: "There is a lot of 'design for bad' out there."

updated Mon Jan 05 2009 04:18:34

World's corals reefs are vanishing, report says

The world has lost almost one-fifth of its coral reefs according a new report released by the International Union for Conservation of Nature (IUCN).

updated Sun Dec 28 2008 12:24:38

NASA captures stunning pictures of Earth

From columns of cloud streaking over the Caspian Sea in January to vast tracts of cleared forest in Bolivia in December. In 2008, the NASA Earth Observatory has captured more stunning images of the Earth.

updated Mon Dec 22 2008 08:44:20

Stabilizing the Earth's climate

CNN's Sara Sidner talks to Nobel Prize Winner, Rajendra Pachauri about the challenges of Global Warming.

updated Wed Dec 10 2008 12:44:04

Poznan climate talks: what's the forecast?

The United Nations Climate Conference underway in Poznan, Poland, hopes to build on the Bali Action Plan adopted by over 180 countries in 2007 and lay the groundwork for a new global climate agreement scheduled to be ratified at next year's climate summit in Denmark.

updated Fri Dec 05 2008 06:10:38

Your emails

There's no point in having a debate without varied points of view. Send us an email by filling out the form on the front page, file an iReport or click on the "Sound Off" button at the bottom of this page.

updated Thu Dec 04 2008 12:18:47

The new Model T?

With the U.S. auto industry's immediate fate now resting on the amount of money that Congress place in their begging bowl, it's worth noting that cash alone is not going to save them in the long run.

updated Mon Nov 24 2008 10:59:43

Rising Sea levels

CNN's Isha Sesay talks to Seawater Foundation Chairman, Carl Hodges about tackling the problem of rising seawater.

updated Mon Nov 24 2008 10:57:52

Living on a water planet

CNN's Maggie Lake meets environmental crusader, Alexandra Cousteau to discuss the prospect of living on an ocean planet.

updated Mon Nov 24 2008 09:05:26

Inaugural alumni meeting for Principal Voices

It's a rare occasion when more than three of our Principal Voices gather in a room at one time to discuss solutions to world problems.

updated Tue Oct 28 2008 05:58:40

Future player: Alexandra Cousteau

If ever there were a person born to be a champion of the environment, it's Alexandra Cousteau. Her father is the enigmatic environmentalist Philippe Cousteau and her grandfather is legendary French explorer Jacques-Yves Cousteau.

updated Fri Oct 24 2008 04:31:57

Sold! Children's art to go under UN hammer

It is an unusual art auction where making money isn't a great concern. But that is the case this weekend when a series of paintings go on the block with the purpose of drawing attention to climate change.

updated Mon Oct 20 2008 12:56:02

Climate changing 'faster, stronger, sooner'

Climate change is happening faster than previously predicted according to a new World Wildlife Fund report.

updated Fri Oct 17 2008 14:33:33

Earth, but not as we know it

Dr Jan Zalasiewicz is the author of "The Earth After Us -- What legacy will humans leave in the rocks?" His book examines what might remain of our civilization in the strata 100 million years from now, and how aliens might piece together the story of the planet and our brief but dramatic impact on it.

updated Fri Oct 17 2008 05:55:19

Doha - round table highlights

One look outside the window gives a glimpse of the "economics of energy" in Doha, Qatar. Cranes dot the tops of half-finished towers, a monumental work in progress; the result of vast energy wealth being pumped out of the ground and poured into project after project.

updated Thu Oct 16 2008 04:07:59

Amory Lovins on energy

Amory Lovins is an environmentalist and the chairman and chief scientist of the Rocky Mountain Institute (RMI).

updated Mon Oct 13 2008 07:57:29

Climate Change Part 1

IPCC Chief Rajendra Pachauri opens the Principal Voices debate in Chicago by expressing optimism for the future.

updated Mon Oct 13 2008 07:57:06

Climate Change Part 2

Carl Hodges, founder of the Seawater Foundation, explains his plan to re-green the earth at the Principal Voices debate.

updated Mon Oct 13 2008 07:56:33

Climate Change Part 3

The Principal Voices discuss the likely impact of the global financial crisis on efforts to combat global warming.

updated Mon Oct 13 2008 07:56:13

Climate Change comments

After the Principal Voices debate, audience members share their views on the discussion and climate change

updated Fri Oct 10 2008 04:58:41

The man behind Wikipedia

Jimmy Wales began the successful peer-reviewed encyclopedia Wikipedia in 2001.

updated Thu Oct 09 2008 07:44:57

Report: One in four mammals face extinction

Nearly a fourth of the world's mammals are threatened with extinction, a leading international conservation group said Monday as it unveiled its latest global study of the problem.

updated Fri Oct 03 2008 11:51:08

Dreaming of a climate bailout

Governments around the world continue to pump billions of dollars into financial markets, but there is still no telling whether the "injections of liquidity" will be enough to prevent "this sucker" -- to quote the President of the United States -- from going down.

updated Thu Oct 02 2008 11:07:18

Frontline pioneer: Carl Hodges

Dr. Carl N. Hodges is turning the tide on sea-level rise and revolutionizing agriculture in the process.

updated Mon Sep 29 2008 06:39:39

Principal Voices: Alexandra Cousteau

The granddaughter of legendary French explorer Jacques-Yves Cousteau campaigns to raise awareness of world water issues.

updated Mon Sep 29 2008 06:39:25

Principal Voices: Rajendra Pachauri

The head of the Intergovernmental Panel on Climate Change (IPCC) is at the forefront of global efforts to combat climate change.

updated Mon Sep 29 2008 06:39:05

Principal Voices: Carl Hodges

The founder of The Seawater Foundation is turning the tide on sea-level rise and revolutionizing agriculture in the process.

updated Tue Sep 23 2008 06:18:19

Rubber ducks aid NASA study

As an organization they're used to investing billions of dollars in scientific experiments that further our knowledge of earth and space. But the only bill to speak of on this occasion is orange and attached to the body of a rubber duck.

updated Mon Sep 22 2008 10:44:38

Principal Voices: Amory Lovins

Amory Lovins tells CNN how his institute is helping resources making the world a life sustaining place.

updated Thu Sep 11 2008 10:01:27

Principal Voices: Malini Mehra

Malini Mehra tells CNN how her company has helped inspire positive social change.

updated Thu Sep 11 2008 10:00:59

Principal Voices: Rory Stear

Rory Stear tells CNN that human based energy in Africa is helping the children to a better life.

updated Thu Sep 11 2008 05:40:08

Principal Voices: Kristin Peterson

Kristin Peterson tells CNN her company's mission is to deliver access to communications to the poorest of places in the world.

updated Thu Sep 11 2008 05:39:46

Principal Voices: Neil Gershenfeld

Neil Gershenfeld tells CNN that digital fabrication will help invent items to help humanity.

updated Thu Sep 11 2008 05:39:24

Principal Voices: Juliet Davenport

Juliet Davenport tells CNN that wind power in the UK is the perfect solution for helping tackle climate change.

updated Thu Sep 11 2008 05:39:05

Principal Voices: Jimmy Wales

Jimmy Wales, founder of Wikipedia, tells CNN that he believes Wikipedia will give the world free access to the sum of human knowledge.

updated Thu Sep 11 2008 05:38:43

Principal Voices: Wangari Maathai

Wangari Maathai tells CNN the importance of planting trees to help maintain a balance on the earth.

updated Wed Sep 10 2008 12:40:45

Bridging the digital divide

Robert Conway is the CEO of the GSM Association, which comprises over 800 GSM mobile phone operators, manufacturers and suppliers from across the world.

updated Thu Sep 04 2008 13:07:23

The Three Little Pigs Project

Early results show the leeward side of the building failing first as shown in this video graphic. Courtesy of University of Western Ontario.

updated Wed Sep 03 2008 04:49:04

Fashion guru sees green

Wayne Hemingway is the English designer who made his name with trendy fashion label Red or Dead. Often outspoken, and known for his green values, Hemingway now designs housing projects -- and he's on a mission to change how we think about sustainable housing.

updated Thu Aug 28 2008 09:25:44

Designing for good

Architect Daniel Lebinskind talks about capturing the imagination of the people in creating buildings.

updated Thu Aug 28 2008 09:20:22

Open architecture network

Cameron Sinclair talks about the concept of the open architecture network.

updated Thu Aug 28 2008 09:14:58

Turning urban China green

Peter Head is playing a leading role in the plans to build China's first eco-cities.

updated Thu Aug 21 2008 10:44:23

Eco communities: Living the green life

The term "eco community" might conjure up an image of bearded hippies tending an allotment before sharing a mung bean stew. But as today's urbanites become more concerned about reducing their carbon footprints, some are finding that modern eco communities offer them a way to live sustainably without foregoing their home comforts.

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