Organizations
World Food Programme
The official World Food Programme Twitter page - fighting hunger worldwide. If you're reading this... you can help! Go to http://www.wfp.org/get-involved282,596 followers | Follow
EcoInteractive
Eco Preservation Society: Inspiring Action, Empowering People,Connecting Communities & Transforming the Planet through Conservation, Reforestation & Education160,928 followers | Follow
World Wildlife Fund
WWF works to build a future in which human needs are met in harmony with nature. Follow World Wildlife Fund and share your love of all things wild.157,956 followers | Follow
World Bank
The official World Bank Twitter feed. The World Bank's mission is to fight poverty with passion and professionalism for lasting results.136,700 followers | Follow
Nature Conservancy
The Nature Conservancy welcomes you to its official Twitter site! We're a leading conservation organization working for people and nature.119,590 followers | Follow
Earth Hour
Dare the World to Save the Planet - Create an I Will If You Will challenge to take your action beyond the hour.76,998 followers | Follow
Greenpeace USA
Saving the planet for 40 years. @meenazahra & @chr15_eat0n here, Tweeting for a green & peaceful future.56,211 followers | Follow
Feeding America
Leading U.S. hunger-relief charity helping more than 37 million Americans each year. Profile managed by Dan Michel.51,737 followers | Follow
Three Avocados
Three Avocados is a non-profit coffee company. 100% of net proceeds provide clean water in Uganda. Order online at http://www.threeavocados.org/50,575 followers | Follow
GlobalGiving
The world is full of problems. GlobalGiving is full of solutions. 10+ years, 1,000+ projects in 100+ countries in 140 characters.42,250 followers | Follow
Sierra Club
Since 1892, the Sierra Club has been working to protect communities, wild places, and the planet itself.39,114 followers | Follow
Sierra Magazine
Environmental news, lifestyle tips, and free-ranging opinion from the editors of Sierra magazine. Our mission: Explore, enjoy, and protect the planet.38,080 followers | Follow
Eco Preservation Soc
Eco Preservation Society: Conservation, Reforestation and Education. We bring it together. Get conected, Get Involved, Make a difference.33,734 followers | Follow
World Resources Inst
Environment and human needs - climate change, global warming, ecosystems, green business, sustainable markets, good governance, sustainable development29,861 followers | Follow
Green For All
Green For All is a national organization working to build an inclusive green economy strong enough to lift people out of poverty.26,099 followers | Follow
Rainforest Alliance
International nonprofit organization working to conserve biodiversity and ensure sustainable livelihoods25,877 followers | Follow
Danielle Nierenberg
We highlight environmentally sustainable ways of alleviating hunger and poverty. Innovation to share? Visit: NourishingthePlanet.org (we follow back)22,500 followers | Follow
Conservation Intl
Conservation International - an environmental organization working with partners in 40 countries around the globe to protect nature for the benefit of people.21,152 followers | Follow
The Climate Group
An independent, not-for-profit org working with government + business leaders to drive a #CleanRevolution. Use # to show the #CleanRevolution in action for RTs.20,344 followers | Follow
Friends of the Earth
Friends of the Earth U.S. defends the environment and champions a healthy and just world.18,673 followers | Follow
Defenders Wildlife
Defenders of Wildlife leads the pack when it comes to protecting wild animals and plants in their natural communities.18,121 followers | Follow
EWG Toxics Team
We use the power of information to protect public health and the environment.17,496 followers | Follow
San Francisco Zoo
The mission of the San Francisco Zoo is to connect people with wildlife, inspire caring for nature and advance conservation action.15,534 followers | Follow
Ocean Conservancy
Ocean Conservancy educates and empowers citizens to take action for our ocean, bringing people together to find science-based solutions for our water planet.15,363 followers | Follow
Leave No Trace
Conservation Education nonprofit committed to the responsible enjoyment of the outdoors.15,119 followers | Follow
OneClimate
OneClimate.net is a new social networking space for sharing ideas and taking action on climate change.15,009 followers | Follow
Green Festival
Gathering to celebrate sustainable ideas & solutions in our communities. NYC April 21-22 | CHI May 5-6 | DC Sept 29-30 | SF Nov 10-11 | LA Nov 17-1813,590 followers | Follow
AMAZON WATCH
Amazon Watch works to protect the rainforest and advance the rights of indigenous peoples in the Amazon Basin.13,154 followers | Follow
Am Geophysical Union
Official account of the American Geophysical Union, the world's largest organization of Earth and space scientists.10,303 followers | Follow
CBD-Cntr for Bio Div
The Center works through science, law, and creative media to secure a future for all species, great or small, hovering on the brink of extinction.9,153 followers | Follow
Forum for the Future
We are a non-profit organisation working globally with business and government to create a sustainable future.9,130 followers | Follow
SF Environment
San Francisco's environment department: Our Home. Our City. Our Planet.9,048 followers | Follow
Concerned Scientists
The Union of Concerned Scientists is the leading science-based nonprofit working for a healthy environment & safer world. I'm Katy, I handle social media at UCS7,850 followers | Follow
Rails-to-Trails
Creating a nationwide network of trails from former rail lines:: Building healthier places for healthier people. And http://www.traillink.com7,795 followers | Follow
RarePlanet
Rare is an international NGO that designs community-based solutions to global conservation challenges. Conservation is about people.7,142 followers | Follow
American Hiking
Protecting the places you love to hike and explore. Become a member of the national hiking community - join us today.6,404 followers | Follow
AllianceToSaveEnergy
The Alliance is your leading resource for energy efficiency news, policy, research and education.6,375 followers | Follow
EarthShare
Connecting individuals & organizations with America's top environmental charities for more than 20 years. Serving up hot eco-news, green tips & more!6,271 followers | Follow
SI Ocean Portal
Dive into the Smithsonian Ocean Portal! Meet amazing creatures, explore the depths of the sea and discover your own connection to the ocean. Find YOUR Blue.5,742 followers | Follow
forestethics
We work in the US and Canada to protect wild places, wildlife, and human well-being in Canada's Endangered Forests.4,574 followers | Follow
Carbon War Room
501c3 global organization harnessing the power of entrepreneurs to implement market-driven solutions to climate change.4,127 followers | Follow
Carbonfund.org
Carbonfund.org, leading nonprofit climate change solutions organization3,711 followers | Follow
Groundswell
We strengthen rural communities to build healthy farming and food systems from the bottom up3,472 followers | Follow
EarthPolicyInstitute
Dedicated to planning a sustainable future as well as providing a roadmap of how to get from here to there.3,463 followers | Follow
Climate Counts
Climate Counts is a NH-based nonprofit aimed at bringing consumers and companies together on climate change3,461 followers | Follow
Trees Water & People
TWP is a 501(c)(3) nonprofit org working to improve people's lives by helping communities protect, conserve and manage their natural resources.2,805 followers | Follow
MASSIVEGOOD
An innovative way to raise funds through travel, to fight HIV/AIDS, malaria and tuberculosis and improve maternal and child health in developing countries.2,672 followers | Follow
John P. Reisman
RealClimate is a commentary site on climate science by working climate scientists for the interested public and journalists.2,550 followers | Follow
farmrsmktcoalition
FMC is a 501(c)(3) nonprofit strengthening farmers markets for the benefit of farmers, communities, and consumers.2,548 followers | Follow
Sustainable Seattle
Our mission is to be a resource and catalyst for positive change, accelerating the adoption of sustainable practices2,388 followers | Follow
TrustforPublicLand
A national land conservation nonprofit working from inner city to wilderness. Follow along for local and national conservation news and updates.2,255 followers | Follow
MillionTreesNYC
is a public-private partnership between NYRP & NYC Parks Dept. through which 1 million new trees will be planted & cared for across NYC’s 5 boroughs by 2017.2,147 followers | Follow
alertnetclimate
News on the human and development impacts of climate change, with writers from places most at risk from a warming planet.2,079 followers | Follow
Katerva.org
Katerva's mission is to identify, award & accelerate game-changing ingenuity. The Katerva Awards are the pinnacle of global sustainability recognition.1,993 followers | Follow
New American Dream
The Center for a New American Dream promotes shifting and reducing consumption to improve quality of life, protect the environment, and promote social justice.1,803 followers | Follow
Dine Green
Find out what the Green Restaurant Association is up to - new Certified Green Restaurants®, news, new partners, new endorsed products, and more.1,654 followers | Follow
EarthEcho Int'l
Thought the Gulf spill was bad? 2.4 million lbs of plastic enter the world’s oceans every hour. Follow us for facts & simple ways to make our oceans cleaner.1,645 followers | Follow
ThinkOutsideThBottle
Corporate Accountability Intl's Think Outside the Bottle campaign protects the human right to water & challenges corporations behind the global water crisis.1,284 followers | Follow
TheConservationFund
Tweets from staff at The Conservation Fund, a leading nonprofit saving your favorite places across America before they become just a memory.1,260 followers | Follow
SELC (Envrnmntl Law)
The Southern Environmental Law Center has a unique mission: use the power of the law to protect the environment and health of the Southeast.1,116 followers | Follow
Climate Ride
250 Riders / New York City to Washington DC and Northern Cali Coast / May & September / 5 Days / 300 miles1,054 followers | Follow
PacNW PPRC
PPRC is the Northwest nonprofit that provides pollution prevention info to business and government looking to improve sustainability & economic performance.972 followers | Follow
Food Lifeline
Largest hunger relief organization in Washington serving over 745,000 people at nearly 300 local food banks, shelters and meal programs.967 followers | Follow
ClimateActionReserve
957 followers | Follow
Comm Enviro Council
The Community Environmental Council is an environmental nonprofit focused exclusively on reducing dependency on fossil fuels.878 followers | Follow
Population Matters
Population Matters is committed to ensuring a sustainable future for humanity and the environment. We campaign to change the way people think about population.725 followers | Follow
Better Paper Project
Our nonprofit encourages the magazine industry to go green by helping publishers choose paper that is good for forests, climate and communities.494 followers | Follow
Green For All - CAP
485 followers | Follow
GlobalCoolFoundation
We communicate sustainability to the mainstream, inspiring those normally turned off by climate change comms to make green lifestyle choices (see @global_cool)436 followers | Follow
Climate Strategies
Climate Strategies is an international organisation that convenes networks of leading academic experts around specific climate change policy challenges.410 followers | Follow
John Bailey
For 19 years I was senior researcher at the Institute for Local Self-Reliance. Looking for work now on clean energy related ventures and policy.375 followers | Follow
CuriOdyssey
The official Twitter account for CuriOdyssey (formerly Coyote Point Museum). Touch Science. Meet Animals. Hillary tweets updates for the museum.236 followers | Follow
Geothermal Resources
With members in more than 40 countries, the GRC is the primary professional educational association for the international geothermal community.189 followers | Follow
