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Vanishing: The Earth's 6th mass extinction
It's worse than you think
'We are failing the elephants'
Imagine a world without giraffes
Listening for the amphibian apocalypse
How our throwaway culture is ruining the planet
Coral reefs expected to be gone by 2050
The great bee die-off: Why you should care
We have 20 years -- at the very most
... but it's not too late to do something
2 degrees: key to climate change
CNN Heroes 2016
'God chose me to help'
Jeison Aristizábal has been named the 2016 CNN Hero of the Year for his work providing educational and medical support for youth living with disabilities in Colombia.
Watch Jeison's big moment
Aristizábal redefines disability
The 10th Anniverary CNN SuperHero is ...
Inside 'CNN Heroes: An All-Star Tribute'
Celebs walk the red carpet
Donate to the Top 10 Heroes
How to nominate a 2017 CNN Hero
White, Working Class & Worried
The town that tried to boot immigrants
The truth about the white working class
2016: Last call for working class whites?
Evangelicals: Christian values are under attack
Opinion: The shell-shocked white working class
Why America's white working class feels left behind
Poll: A complicated view of Muslim immigrants
The 'forgotten tribe' in West Virginia
They blame Washington but still want more help
The anatomy of a white, working class Trump voter
The economy stinks, but I'm OK
9/11 Fifteen Years Later
What the children of 9/11 can teach us
More than 3,000 children lost a parent on that awful day. Fifteen years later, in a world rocked by terror, this group has hard-won wisdom to share. Here, in their own words, is a glimpse into their journeys.
A place to belong
A party of 10, raising each other
Bound by terror: 'I've got you'
9/11 kids to terrorists: 'You lose'
The day that never ends
Could this smog-eating tower end pollution in China?
Documenting the giant panda revival
We Will Rise: Michelle Obama's mission to let girls learn
The forgotten victims of gun violence
The 'other' gun lobby
The massacre that didn't happen
The gun club no one wants to join
Paying kids not to kill
Southern charm, deadly streets
This is how the NRA loses
Guns in America: CNN's investigation into the impact and business of guns
More from CNN's Longform journalists
Killed for their beards and turbans
The taste of salt, the smell of nitro
From the darkness of disaster, a ray of hope for one girl
Is Black Lives Matter blowing it?
Running for -- not from -- mental illness
'Outlaw bikers' open up about clubs, culture and Waco
'I'm an abortion travel agent' and other tales from Texas' new desert
'I'm not the Obamacare kid anymore'
The oldest cold case to be solved?
A desperate day at sea
How heroin is scarring the next generation
The secret costs of Islamophobia
Do these '60s children hold Zika clue?
25 of the most iconic photographs
Look back at some of the photographs that have helped define modern history.
Amazon natives hold on to tradition
Show animals and their proud handlers
Nineteen years under the rainbow
The Kurdish women fighting ISIS
Girls behind bars tell their stories
Up close in the brutal world of a female fight club
Crawling in a 'polio-free' country
Giving a face to Sudan's refugee crisis
Federal program for disabled 'like the mafia'
Schools knew of trouble before student deaths
The real story behind Planned Parenthood videos
Sources: Work program mired in fraud
Athletes allege abuse and racism at University of Illinois
FTC: 4 cancer charities are shams
Hidden cameras reveal airport workers stealing from luggage
Poisoned by pesticides: Sons can't eat or walk alone
It's not over: Veterans waiting months for appointments
IRS scam costing victims $15 million
U.S. Indian school's fundraising letters sent to millions signed by fictitious kids
Politicians live it up and have the lobbyists pay
Great American Stories
The quietest town in America
Can you imagine living in a town where cell phones and other wireless devices aren't allowed? Welcome to Green Bank, West Virginia.
Utopia: It's complicated
How crickets could be the future of food
Rushing to save citrus
America's only metric road
Impact Your World
Aid and assistance for Iraqis fleeing Mosul
Dolly Parton's passion isn't just music...it's also literacy
Flint residents still need help with water crisis
Preschool girl lifts widower's spirits
Help educate girls and 'We Will Rise'
Former President Jimmy Carter's 32-year passion project
Help Syrians survive the conflict
What you can do to help in the migrant crisis
CNN Freedom Project
#FlyToFreedom: You can help end slavery
Report: Mauritania no longer the world's slavery capital
'How modern slavery is destroying the environment'
How a child predator was caught by tiny clue in photo he posted online
Trafficking survivor who smashed triathlon world record
Girls smuggled into China and sold as brides
In Case You Missed It
CNN's John D. Sutter explores climate change and the importance of one number: 2 degrees Celsius.
Change the List
CNN's John D. Sutter tackles five topics you selected to help bring change to bottom-of-the-list places.
Future of Adventure
Explore the designs and innovations that enable us to experience the world in thrilling new ways.
Meet the next wave of explorers tackling challenges on land, sea and air.
CNN Digital Shorts
CNN Films and CNN Digital Studios present original short films directed by established and rising filmmakers.
City of Tomorrow
Emerging technology is beginning to tackle looming 21st century problems.
Most Innovative Cities
See these cities' creative solutions to pressing urban problems: jobs, schools, transportation and more.
Our love-hate relationship with the super rich: Mansions, superyachts and other splurges.
Whether you remember the 1960s or not, this decade's influence on American culture is still evident today.
Our health is not just a byproduct of how we live but also where. Just ask the residents of these 10 cities.