Iran has declared a two-day public holiday in Tehran after air pollution hit dangerous levels.
Dozens of garbage pickers pounce on the black and white trash bags as they tumble out of the latest truck to dump its load at the summit of the Gramacho landfill.
A rise in global temperatures of four degree Celsius is likely to occur during the 21st century causing "devastating impacts" if greenhouse gas emissions continue rising at the current rate, according to a group of international scientists.
The latest round of United Nations climate change talks begins Monday in the coastal resort city of Cancun, Mexico.
The next round of international climate meetings begin Monday in Cancun, Mexico, and they will likely determine the future for global action on climate change -- including whether the United Nations will remain at the core of an international regime.
Two European-bred cheetahs are set to take part in a pioneering program to release their young back into the wild in an attempt boost their declining numbers.
Evidence of man-made warming has increased in the past year, according to one of the world's leading climate research centers.
The wild tiger population is less than 4 percent of what it was a century ago, and leaders in 13 nations are taking a stand against the poaching and habitat destruction that have decimated the majestic predators' numbers.
Mayor Lois Jackson, Delta, BC, Canada, on reducing carbon emissions by promoting green jobs.
Mayor Frank Cownie, from Des Moines, Iowa, U.S., on maximizing the potential for products to be recycled.
How much would it cost to save tigers from extinction in the wild? Thirty-five million more dollars a year.
Governments must make bolder and more binding commitments to reduce carbon emissions, according to a new United Nations report.
Mayors from around the world have signed a voluntary pact committing them to reduce urban greenhouse gas emissions at a climate summit in Mexico City.
In 2010, the Year of the Tiger, about 3,600 of the majestic predators remain in the wild, their existence threatened by habitat-loss and poaching.
The pea-soupers maybe a thing of the past but London still has some of the worst air quality in Europe.
The World Mayor's Summit highlights action to combat climate change in urban areas. What would you ask city leaders?
Thirty years after Chinese officials instituted the country's controversial one-child population control policy, lawmakers in one of China's largest cities are weighing a one-dog policy for pet owners.
Over 450 photographers originally entered the competition, but now that number is down to just 12 as organizers of the annual Prix Pictet photography competition announced their shortlist for the 2011 prize on Thursday.
A baby koala was fighting for life Thursday, nearly a week after it was shot in eastern Australia.
Whales in Mexico's Gulf of California are showing worsening signs of sunburn according to new report published Wednesday.
An Egyptian music group uses all sorts of trash to promote a green message of recycling and environmental awareness.
City mayors from all over the world will be attending the World Mayors Summit on Climate in Mexico City later this month to pledge their commitment to combating global warming.
As inhospitable environments go, it doesn't get much trickier than living near the Arctic Circle where the temperature can plummet to minus 40 degrees Celsius in the permanent winter darkness and the diet consists of walrus and whale blubber.
A deal to protect the world's ecosystems over the next decade has been agreed by the United Nations at the biodiversity summit in Nagoya, Japan.
The World Bank is set to turn nature into numbers in a five-year pilot study to incorporate the value of ecosystems into countries' national accounts.
This week, I have had the opportunity to meet with ministers and country delegates from around the world who have gathered in Nagoya, Japan, to set a global conservation action plan for the next ten years.
A fifth of the world's vertebrates are facing extinction because of invasion and the effects of agriculture, a global study warned Wednesday.
More than 1,200 new species of plants and animals have been discovered in the Amazon rainforest over the past decade according to a new report.
Hungarian photographer Bence Mate has won the 2010 Veolia Environnement Wildlife Photographer of the Year title for his photo "A marvel of ants."
Rising numbers of captive tigers in the United States are putting citizens at risk and could be fueling illegal trade in animal parts, which threatens their survival in the wild, conservationists have warned.
Delegates from all over the world descended on Nagoya in Japan on Monday for talks considered crucial to sustaining the future of animal, plant and human life on Earth.
A microscopic image of a mosquito's heart has taken first place in a prestigious photography competition.
CNN's Diana Magnay looks ahead to the re-opening of the MAL Aluminum Plant responsible for the red toxic sludge.
Shocking safety lapses exposed by the deadly Hungary toxic sludge spill could be repeated at thousands of industrial sites around the world unless regulations are tightened dramatically, campaigners have warned.
Residents were evacuated and soldiers were on standby Sunday as authorities believe a damaged reservoir wall may unleash a second wave of toxic sludge onto a Hungarian village, an official said.
Representatives from about 200 countries wrapped up a meeting in China on Saturday on climate change and said they had moved closer to defining what could be achieved at a later conference.
Authorities were evacuating a Hungarian village Saturday after they found new damage in the reservoir that caused a toxic sludge spill this week, an emergency services spokeswoman told CNN.
CNN's Nic Robertson meets a man whose dreams have been shattered by the toxic sludge that covers his Hungarian village.
Dutch cyclists are riding from Alaska to Argentina on bamboo bikes to raise awareness of the global water crisis.
The death toll from a toxic sludge spill in Hungary rose to seven Friday after an additional body was found, according to a spokeswoman for Hungary's emergency services department.
A new study has shed light on the sun's impact on the Earth's climate, confounding current thinking about solar cycles and how they influence temperatures on Earth.
CNN's Nic Robertson breaks down the implications of the toxic red sludge reaching the Danube River.
The Hungarian government Thursday made an urgent request to the European Union for help in the cleanup effort after a reservoir holding industrial waste burst earlier in the week.
A tide of toxic red mud burst through the walls of a giant storage reservoir at the Ajkai Timfoldgyar alumina refinery on the outskirts of Akja, a small town in the county of Veszprem, Hungary on Monday, October 4.
As many as 400 children have died of lead poisoning-related illnesses in Nigeria since March, two international aid groups say, and as many as 30,000 people could be affected by lead contamination.
The River Thames has frozen over, the land around the Houses of Parliament has been re-purposed as a paddy field and the constant din of traffic around Piccadilly Circus has been replaced by the whirring of turbine blades.
Four people, including two children, were killed after a reservoir broke and flooded three villages in western Hungary with toxic red mud, officials said Tuesday.
The planet's seas and oceans are richer and more diverse than scientists suspected, the biggest survey of marine life has revealed -- but many mysteries remain.
Representatives from about 200 countries start meeting on Monday in China to narrow differences on climate change and grapple with extreme weather such as rising temperatures and melting polar icecaps.
Over one-fifth of the world's plant species are threatened with extinction according to a new study compiled by the UK's Royal Botanic Gardens at Kew, London.
CNN's Diana Magnay reports on the impact of the toxic water filling the mining basins below Johannesburg.
Cell phones have become one of the most ubiquitous hallmarks of life in the 21st century, but they aren't necessarily good for the environment.
They may be cleaner than their gas-guzzling cousins, but manufacturers are increasingly concerned that electric cars' near-silent motors could pose a problem for pedestrians navigating city streets.
A baby zedonk, an unusual cross between a donkey and a zebra, is an eye-catching animal attracting attention from around the world.
The pangolin has become a creature facing extinction. CNN's Dan Rivers reports.
A German experiment tests unusual method to stop gases at a coal plant. CNN's Fred Pleitgen reports.
CNN's Richard Roth reports on a New York restaurant with its own farm on the roof.
Germany is often viewed as one of the most advanced countries in the world when it comes to protecting the environment.
The world's largest offshore wind farm opened Thursday off the British coast, with 100 wind turbines capable of supplying enough electricity for 200,000 homes a year.
Greenpeace activists who have interfered with the launch of a Chevron oil drilling ship in the North Sea say that they have enough fuel and supplies to last several weeks.
CNN's Liz Neisloss reports from Chennai, India, on one woman's efforts to save threatened baby turtles.
Three years after Russian divers thrust a rust-proof flag into the seabed below the North Pole, the country is again staking its claim on the Arctic region.
CNN's Matthew Chance explains why leaders are meeting in Russia over the future of the Arctic.
CNN's Rafael Romo examines efforts to save Tijuca Forest, one of the last remaining patches of Brazil's Atlantic forest.
You don't have to look far to get an idea about air quality in Paris. CNN's Jim Bittermann reports.
CNN's Errol Barnett reports on Coca-Cola's efforts to go green.
Plans to build a highway through Tanzania's Serengeti National Park will destroy one of the world's last great wildlife sanctuaries, a group of conservation experts has warned.
A group of international and Kenyan scientists believe they may have discovered a new mammal species in a Kenyan forest near the Somali border.
When it comes to air pollution, Paris is not much different from any other European city. It has its good days and its bad.
Scientists have confirmed the first sighting in more than a decade of one of the world's rarest animals -- the saola, sometimes called the Asian "unicorn."
CNN's Diana Magnay sees the latest "green" ideas from Alexander Voigt, CEO of Younicos.
Polar bears clinging to melting ice sheets have become one of the most frequently used images to portray the perils of climate change.
More Arab countries look to nuclear power to meet growing energy demands. CNN's Leone Lakhani reports.
Forty-year-old Bayanmunkh has learnt the hard way about overgrazing. Riding slowly behind his herd of close to 2,000 animals across Mongolia's arid plains, the herder reminisces about how the land has changed.
A massive ice island four times the size of Manhattan that broke off the Petermann Glacier early last month has split in two.
A new sound will ring out from the banks of London's River Thames later this month when a bell marking high tides and the threat of rising sea levels is officially unveiled.
A new picture index is helping scientists monitor long-term trends in rare animal species around the world using strategically placed remote cameras.
Many Hong Kong residents blame factories in Southern China for the heavy pollution that hangs over the city, but local polluters are also to blame, including the ships that regularly pass through waters close to the congested city.
CNN's Andrew Stevens talks with Maersk's North Asia CEO about a new fuel alternative for its vessels.
A court in northern Japan found two Greenpeace activists guilty Monday for stealing whale meat, but suspended their sentences, Greenpeace Japan said.
For 38-year-old Bayanzul it was just one winter too far. After losing a third of his herd in the -45 degree temperatures that struck Mongolia last winter, the long-time herder has decided to give up on the nomadic life and try his luck in the city.
Movie director, James Cameron has teamed up with environmental campaigners in an effort to help Brazilian tribes' epic fight against the construction of a controversial dam in northern Brazil.
The United Nations' climate body needs to "fundamentally reform" if it is to prevent a repeat of the error that led to the publishing of a report warning that Himalayan glaciers could melt by 2035, an international committee reported Monday.
A British anthropologist is setting out on a year-long stay with a small community in Greenland in an ambitious attempt to document its dying language and traditions.
A NASA scientist looks at whether heat waves, wildfires, flooding and breaking icebergs are somehow related.
British explorer Ed Stafford finishes his two-year, 4,000-mile trek along the Amazon. CNN's Fionnuala Sweeney reports.
CNN's Fionnuala Sweeney has an overview of Ed Stafford's 28-month expedition to walk the entire length of Amazon River.
Ed Stafford discusses his goals and interactions with indigenous tribes as he walks the length of the Amazon.
We're definitely on the home straight, but things aren't easy due mainly to lack of sleep and the miles that we still have to walk by our self-imposed deadline of Monday 9th.
British explorer Ed Stafford discusses the charities he's raising money for as he walks the length of the Amazon River.
British explorer Ed Stafford discusses the technology he uses to stay in touch and what he does for fun in the Amazon.
As my tweet reported in real time on the 30th July - Cho and I have been spat out of the jungle for the very last time.
With eleven days to go things are already beginning to change for Cho and I.
Six thousand matching black, silver and blue bicycles will hit the streets of London on Friday as the city officially launches its ambitious public bike sharing scheme.
International scientists have injected fresh evidence into the debate over global warming, saying that climate change is "undeniable" and shows clear signs of "human fingerprints" in the first major piece of research since the "Climategate" controversy.
Tourists visiting the Spanish island of Tenerife will soon be able to stay in the world's first bioclimatic holiday village.
I wake up with the light, just before 6 a.m., and reach for my vitamin pills hanging above my hammock. I get out of bed and peer through the gloom to see if Cho is up yet and has started the fire. If so, I will probably go to the river and check the fishing net to see if we have a catch.
Australian Prime Minister Julia Gillard on Friday embraced the same policy on climate change that her predecessor failed to pass, but said in a campaign speech that any action would be delayed until at least 2012.
Six thousand matching black, silver and blue bicycles are about to hit the streets of London on Friday as the city launches an ambitious public bike sharing scheme.
Scientists have produced the first worldwide map showing the height of forests using data from NASA satellites.
Wildlife researchers in Sri Lanka have photographed one of the world's most reclusive primates for the first time.
An unmanned solar aircraft has smashed the world record for continuous flight.
The destruction of the world's mangrove forests is happening up to four times faster than the world's land-based forests, according to a new United Nations report.
Have British scientists solved the chicken and egg conundrum? CNN's Eileen Hsieh finds out.
CNN's Fred Pleitgen reports on a conservationist who won a landmark victory in Poland.
It is not without pride that Malgorzata Gorska climbs an unfinished highway bridge near the town of Augustow in Eastern Poland.
Yvon Chouinard opened up the old corrugated metal shed that sat in the middle of the work campus.
The Patagonia retailer founder speaks to CNN's Richard Roth about his green pioneering ways.
Researchers in Britain have been credited with cracking the age-old conundrum about the chicken and the egg. But are they right?
China's third largest freshwater body of water, Lake Tai, is at once placid and majestic, until it reveals its dirty secret.
CNN's Emily Chang meets Wu Lihong, former prisoner and passionate campaigner for China's Lake Tai.
CNN's Brian Byrnes reports on one architect's groundbreaking ideas in urban planning.
I had been standing on the street with Jaime Lerner for less than one minute when a stranger stopped to greet him.
CNN's Dan Rivers meets Rizwana Hasan, a lawyer fighting to clean up Bangladesh's ship-breaking industry.
Rizwana Hasan is a divisive figure in Bangladesh. Heralded by some as an eco-pioneer, a labor rights campaigner and a "take no prisoners" lawyer, she also is characterized as being on a mission to destroy an industry that employs thousands.
Whether he's out on the ocean monitoring stingrays in the Caribbean, or back on land painting in his studio, Guy Harvey spends all his time surrounded by fish.
Muir Russell summarizes the key findings of an independent report into leaked emails from the University of East Anglia.
A solar-powered aircraft which one day hopes to circle the globe has started a 24-hour test flight in Switzerland.
An independent report released Wednesday into the leaked "Climategate" e-mails found no evidence to question the "rigor and honesty" of scientists involved.
The controversy known as "climategate" erupted in November 2009 with the publication of more than 1,000 e-mails to and from scientists at the Climatic Research Unit (CRU) of the University of East Anglia in eastern England.
An independent report into leaked e-mails that appeared to question climate change data is due to be published Wednesday.
Underwater photographer Gavin Newman shows CNN images filmed by Greenpeace hundreds of meters below the Arctic ice.
An expedition by environmental group Greenpeace has revealed a stunning array of sea life on the Arctic Ocean seabed.
One of the world's largest pulp and paper companies is destroying Indonesia's rainforests and taking away the habitat of rare animals, environmental group Greenpeace charged Tuesday.
A field in the heart of the English countryside has been transformed into a sea of shimmering light thanks to one designer and 600,000 unwanted CDs.
Researchers scanning the Peruvian desert for whale fossils have stumbled upon the remains of a "sea monster" three times the size of a modern day killer whale.
A new study has suggested that cell phone radiation may be contributing to declines in bee populations in some areas of the world.
His most famous car has a top speed of 240 miles per hour.
Australia is asking an international court to weigh in on Japan's whale-hunting practices, officials said Tuesday.
The private sector will have to pay more towards efforts to tackle climate change, as the European sovereign debt crisis leaves governments facing pressure to cut spending, Norway has warned.
Less explored than the surface of the moon, the deepest depths of our planet's oceans are host to some of the most bizarre-looking creatures on Earth.
Indonesia's president on Wednesday announced a two-year moratorium on new concessions to convert virgin forests and peat lands into plantations, part of an internationally backed strategy to reduce greenhouse gas emissions from deforestation.
CNN founder Ted Turner says the recent oil spill and coal mine disasters could be a message from God.
Take a tour of what's being billed as the first farmers market in the UAE.
CNN's Brian Byrnes reports on a new form of consumer activism taking root in Buenos Aires.
CNN's Anna Coren heads to South Korea for a tour of what promises to be the world's largest tidal power plant.
In a photo essay recorded in the Arctic for CNN, photographer Martin Hartley documents the extreme hardship endured by explorers working for the Catlin Arctic Survey.
CNN's Colleen McEdwards reports on how Nike has gone green.
CNN's Phil Black finds out if consumers in London are prepared to pay more for green goods and services.
Farmers in India are ditching chemicals and returning to traditional farming methods. CNN's Mallika Kapur reports.
CNN's Maggie Lake looks at what the "organic" label really means.
CNN's Isha Sesay looks at ways two ecologically-rich barrier islands off Puerto Rico try to increase eco-tourism.
CNN's Pauline Chiou tests the air from the streets of Hong Kong as remnants of a weekend dust storm remain.
Participants at a U.N. meeting in Doha reject proposals to loosen the ban on ivory sales. CNN's David McKenzie reports.
15-year-old Parker Liautaud discusses his plan to become the youngest person to ski to the geographic North Pole.
CNN's Phil Black reports on how recent scientific scandals are impacting the debate on climate change.
French wines may be tasting different these days, and some blame global warming. CNN's Jim Bittermann reports
At the World Future Energy Summit in Abu Dhabi, Monaco's Prince Albert weighs in on Copenhagen and alternative energy.
The Maldives president asks an Abu Dhabi energy summit to save his nation from disappearing. Mohammed Jamjoom reports.