Nature
Leonardo DiCaprio
http://www.facebook.com/LeonardoDiCaprio www.saveTIGERSnow.org www.leonardodicaprio.com2,678,003 followers | Follow
National Geographic
Since 1888, we've traveled the Earth, sharing its amazing stories with new generations. Official Twitter account of National Geographic.1,891,161 followers | Follow
Earthquake & Tsunami
Earthquake & Tsunami Warning | not affiliated with USGS217,090 followers | Follow
TreeHugger.com
Links, Ideas and Conversation from the TreeHugger hive mind, the latest in modern green.169,018 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.119,069 followers | Follow
Josef Biesenberger
CO2 Climate change Finance Green Energy Ecology Polls Renewable Solar Stocks Sustainability Wollwürste97,045 followers | Follow
350 dot org
Join a global movement that's inspiring the world to rise to the challenge of the climate crisis. 350=safe upper limit of CO2 in atmosphere. Photo by @julkosch95,214 followers | Follow
National Wildlife
National Wildlife Federation works to inspire Americans to protect wildlife for our children's future. Staff updating: @starfocus @rarewildlifeguy @ksuzj89,108 followers | Follow
Guardian Environment
Green news, comment & more, run by the environmentguardian.co.uk team, inc @james_randerson & @adamvaughan_uk & @dpcarrington86,195 followers | Follow
Dept. of Agriculture
Stay up to date with the latest news, events and info from the U.S. Department of Agriculture - and live tweeting, too!75,890 followers | Follow
National Trust
National Trust - charity, protecting historic houses, gardens, woods, coast, countryside... & opening them for you to enjoy. We're about from Mon-Fri 9-5.68,472 followers | Follow
Steve Momorella
Providing real-time news about green energy and the environment.66,415 followers | Follow
NYT Green Blog
Green: A Blog About Energy and the Environment from The New York Times63,508 followers | Follow
Surfrider Foundation
Dedicated to the protection and enjoyment of oceans, waves and beaches through a powerful activist network60,130 followers | Follow
Greenpeace USA
Saving the planet for 40 years. @meenazahra & @chr15_eat0n here, Tweeting for a green & peaceful future.56,005 followers | Follow
Green Energy News
Your source for green energy news and eco-friendly products | Green Marketing & Advertising | Sustainable brands & technology- Offering HD video production!46,761 followers | Follow
NOAA's Ocean Service
NOAA's National Ocean Service is the nation's premier federal science agency for oceans and coasts.44,101 followers | Follow
Friends of the Earth
We see the wellbeing of people and planet as one and the same. This inspires our campaigns on climate, energy, wildlife and living within the planet’s limits.42,751 followers | Follow
Sierra Club
Since 1892, the Sierra Club has been working to protect communities, wild places, and the planet itself.38,921 followers | Follow
Earth Institute
Mobilizing the sciences, education and public policy to achieve a sustainable earth36,646 followers | Follow
Andy Revkin
Pursuing progress on a finite planet on http://j.mp/dotEARTH and at Pace U. The rest? Family, friends, living, music: http://j.mp/unclewade35,363 followers | Follow
Lisa P. Jackson, EPA
Administrator of the U.S. Environmental Protection Agency32,465 followers | Follow
Tim@Best Green Blogs
Tweets, retweets & follows all things #green #eco #organic #sustainable. Homesteader in TN. Friend of Dorothy. DM me your green & enviro. stuff.30,975 followers | Follow
FuturePowerG
Future Power Generation promotes geothermal energy solutions in particular and alternative, renewable energy creation in general.29,738 followers | Follow
Greenversations
The official blog of the U.S. Environmental Protection Agency28,961 followers | Follow
National Zoo
The Smithsonian's National Zoo demonstrates leadership in animal care, science, education, and sustainability.27,790 followers | Follow
US Dept of Interior
Protecting America’s Great Outdoors and Powering Our Future27,651 followers | Follow
Climate Progress
Blog dedicated to providing the progressive perspective on climate science, climate solutions, and climate politics.27,404 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.25,978 followers | Follow
Earth Observatory
NASA images, stories, and discoveries about climate and the environment.22,690 followers | Follow
Marnie Glickman
Activist, mom, former co-chair Green Party of the US, worked as managing director of Green Party of California21,443 followers | Follow
USDA Forest Service
The Forest Service manages public lands in national forests and grasslands, which encompass 193 million acres.21,171 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.21,049 followers | Follow
US EPA News
Automated news releases from the US Environmental Protection Agency. Note: Twitterfeed sometimes breaks, so pls let @levyj413 know.20,760 followers | Follow
NYTimes DotEarth
NYTimes.com/DotEarth is Andrew C. Revkin on Climate Change and Sustainable Living20,416 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.20,237 followers | Follow
NOAA Ocean Explorer
NOAA Ocean Explorer is an educational Internet offering for all who wish to learn about, discover, and virtually explore the ocean realm.19,898 followers | Follow
The Audubon Society
The original tweeters. People working together to protect birds, other wildlife and the natural resources that sustain us all, since 1905.19,503 followers | Follow
smarterplanet
Official Smarter Planet Twitter account. Managed by Kevin Winterfield and George Faulkner. Follows the IBM Social Computing Guidelines.18,979 followers | Follow
PBS Nature
Wednesdays at 8PM on PBS (check local listings). Tweets by the NATURE team.18,673 followers | Follow
Friends of the Earth
Friends of the Earth U.S. defends the environment and champions a healthy and just world.18,574 followers | Follow
The Cove/OPS
Micro updates on all things The Cove, the award winning film brought to you by the Oceanic Preservation Society, www.opsociety.org17,490 followers | Follow
U.S. EPA Water
The Environmental Protection Agency's Office of Water- working for clean water for all Americans16,900 followers | Follow
NYTimes Environment
Breaking news and environmental news on the EPA, oceans and marine life, weather, wetlands, pollution, wildlife, global warming, hybrid cars, energy and nature.16,859 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.15,509 followers | Follow
Argonne National Lab
As a @ENERGY lab, Argonne delivers science and tech solutions to energy, environment and security challenges. Tweeting for Argonne is web-editor @SoosheBot.15,326 followers | Follow
NatGeo Green
Green living tips, and environment news, stories, and pictures from National Geographic.13,361 followers | Follow
AMAZON WATCH
Amazon Watch works to protect the rainforest and advance the rights of indigenous peoples in the Amazon Basin.13,132 followers | Follow
Blue Planet Society
Campaigning to stop overfishing and to protect marine life11,032 followers | Follow
Am Geophysical Union
Official account of the American Geophysical Union, the world's largest organization of Earth and space scientists.10,263 followers | Follow
Scripps Oceanography
Scripps Institution of Oceanography is one of the oldest, largest, and most important centers for marine science research, graduate training, and public service9,938 followers | Follow
Austin Pets Alive!
Nonprofit organization dedicated to making Austin, Texas a no-kill city. Since 2008, APA! has saved the lives of more than 13,000 dogs and cats in Central TX.9,481 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.9,111 followers | Follow
Microsoft_Green
The official Twitter account for Microsoft's Environmental Sustainability team9,000 followers | Follow
Heal the Bay
Official HtB Tweeter, making SoCal's coastal waters & watershed, including Santa Monica Bay, safe, healthy, & clean (with your help, because you love it!)8,832 followers | Follow
San Francisco SPCA
The mission of the San Francisco SPCA is to save and protect animals, provide care and treatment, advocate on their behalf and enhance the human-animal bond.8,240 followers | Follow
CA State Parks
Official California State Parks Twitter feed. Contact media@parks.ca.gov7,949 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 UCS7,823 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.com7,754 followers | Follow
Summer Rayne Oakes
I run barefoot and collect bugs. In my spare time I'm an undercover model working on environmental programs worldwide.7,596 followers | Follow
RestoreTheGulf.gov
RestoretheGulf.gov is the official federal portal for the Deepwater BP oil spill response and recovery.7,332 followers | Follow
Sylvia A. Earle
Oceanographer, National Geographic Explorer-In-Residence, 2009 TED Prize Winner. Dedicated to saving and restoring the ocean, the blue heart of the planet!7,102 followers | Follow
World Land Trust
International conservation charity funding the protection of rainforest and other wildlife habitats. Donate at http://www.worldlandtrust.org/supporting/donate6,974 followers | Follow
Audubon Institute
Zoo, Aquarium, Insectarium, & IMAX Theater. Celebrating wonders of nature. In love with New Orleans. Get our free e-news: http://conta.cc/iinuOt.6,839 followers | Follow
Care Environment
6,701 followers | Follow
Mission Blue
Mission Blue is a global partnership initiative to raise public awareness and move people to help protect this vital natural resource.6,111 followers | Follow
Veterans Green Jobs
Veterans Green Jobs provides green jobs education and career development opportunities for military veterans. External links, follows & RT's do not=endorsement5,894 followers | Follow
GRI Secretariat
The Global Reporting Initiative's (GRI) mission is to make sustainability reporting standard practice by providing guidance and support to organizations.5,750 followers | Follow
CA State Parks Found
CSPF is the only statewide independent nonprofit organization dedicated to protecting, enhancing and advocating for California's magnificent state parks5,627 followers | Follow
SustFoodSystems
Sustainable Food Systems transforms food programs to be more healthy and sustainable.5,595 followers | Follow
Tom's of Maine
Like you, we believe our actions have an impact on the people and world around us. That's why we try to do good every day. Let's get some goodness going on!5,415 followers | Follow
US EPA Mid-Atlantic
EPA's mid-Atlantic region protects human health and the environment in Del, DC, Md, Pa, Va and WVa.4,844 followers | Follow
First Ascent
First Ascent is Eddie Bauer’s line of guide-built gear. For 24/7 service support, call 1-800-426-8020.4,661 followers | Follow
Friends of the Earth
Friends of the Earth International is the world's largest grassroots environmental network. We campaign on today's most urgent environmental and social issues.4,610 followers | Follow
SF Water Power Sewer
San Francisco Public Utilities Commission - Your awesome water, wastewater and municipal power agency!4,569 followers | Follow
Ashleigh J
Fully qualified Solar PV installation teams available throughout the UK for domestic and commercial installations. Call (Freephone) 033320054444,507 followers | Follow
Sustainable Harvard
Making Harvard University greener and healthier one tweet at a time. Managed by Office for Sustainability.4,482 followers | Follow
Tim Dickinson
I cover the National Affairs beat for Rolling Stone. 415tim@gmail.com RT = plausibly deniable endorsements Favorites=bookmarks/to-read-laters4,312 followers | Follow
Matt Weiser - Sacbee
I cover water & environment news for the Sacramento Bee. Follow Sacramento-San Joaquin Delta issues here. Email me: mweiser (at) sacbee.com4,092 followers | Follow
Sender Films
Sender Films is a leading producer of climbing/mountaineering and outdoor adventure films.4,077 followers | Follow
Appalachian Mtn Club
The Appalachian Mountain Club (AMC) promotes the protection, enjoyment, and understanding of the Northeast outdoors.3,949 followers | Follow
The Ruckus Society
providing the tools, tactics and strategy for the movement through direct action training and action support3,829 followers | Follow
GreenEnergyReporter
Green Energy Reporter provides insight on the people, investments and policies affecting renewables. Request a free trial access.3,621 followers | Follow
Eric Pooley
SVP for strategy and communications at Environmental Defense Fund, author of The Climate War3,484 followers | Follow
Bay Nature
Bay Nature is dedicated to educating the people of the San Francisco Bay Area about, and celebrating the beauty of, the surrounding natural world.3,477 followers | Follow
Save the Gulf
A collaborative effort of al.com, Mobile's Press-Register, The Mississippi Press and GulfLive.com.3,415 followers | Follow
Urban Botanics
At Urban Botanics, we provide landscape design & installation, home remodeling & construction, plus interior design in the San Francisco Bay Area.3,384 followers | Follow
NOAA Teacher at Sea
NOAA’s Teacher at Sea program gives K-16 teachers insight into our ocean planet & increases understanding of earth system science through real research projects3,004 followers | Follow
Lincoln Institute
The leading resource for key issues relating to the use, regulation, and taxation of land.2,819 followers | Follow
amywestervelt
Independent writer and editor. Forbes greentech blogger. Member, SEJ. www.amygaga.com2,817 followers | Follow
NEEF - environment
The National Environmental Education Foundation: Knowledge to live by.2,600 followers | Follow
Fabien Cousteau
Stimulating marine education and restoration initiatives around the world.2,533 followers | Follow
NH's White Mountains
Official information and website for New Hampshire's White Mountains.Questions? Use #whtmts in your tweet. We will help.2,488 followers | Follow
Nick Grossman
Student of cities and the Internet. @civicmit, @openplans, @codeforamerica, @civcoms2,444 followers | Follow
Alex Evans
Globalisation / resource scarcity / development / resilience. Based at NYU Center on International Cooperation and Brookings. Co-editor of GlobalDashboard.org.2,382 followers | Follow
RocktheEarth
Rock the Earth is a not-for-profit, national public interest environmental organization dedicated to protecting and defending America's natural resources!2,300 followers | Follow
350.org MediaRoom
Breaking news on 350.org and climate change alongside dispatches from the grassroots climate movement.2,289 followers | Follow
TrustforPublicLand
A national land conservation nonprofit working from inner city to wilderness. Follow along for local and national conservation news and updates.2,244 followers | Follow
EDF's CA Offices
EDF_CA works on leading-edge environmental markets and solutions, with a focus in the West. Tweets brought to you by@lorisinsley & @jenwitsf2,192 followers | Follow
On-Board Solutions
The new ONboard iPad app provides a place for owners to connect with your yacht’s manufacturer, dealer and mechanic.2,180 followers | Follow
Canine Companions
Highly trained assistance dogs for children and adults with disabilities, provided free of charge, since 1975.2,044 followers | Follow
Save The Bay (SF)
Save The Bay is the largest regional organization working to protect, restore and celebrate San Francisco Bay.1,947 followers | Follow
Columbia Climate Law
Columbia Law School's Center for Climate Change Law develops legal techniques to address climate change and trains the next generation of leaders in the field.1,818 followers | Follow
Forest Justice
Forest Justice wants YOU to work with us to have an impact on reducing tropical deforestation. Check us out on www.facebook.com/forestjustice and Get Involved!1,742 followers | Follow
Son Energy
Son energy specializes in solar energy, paving the way for a green future. We do residential (water heater, and electrical), and commercial.1,696 followers | Follow
BODC — marine data
British Oceanographic Data Centre - a national facility for preserving and distributing oceanographic and marine data.1,618 followers | Follow
Madhusudan Katti
Reconciliation ecologist, evolutionary biologist, birdwatcher, teacher, cine buff, amateur nature photographer, & father of two girls. Also likes cricket!1,385 followers | Follow
EDF Louisiana
Environmental Defense Fund's Mississippi River Delta Restoration team, working to restore the ecosystem and economy of America's largest delta.1,367 followers | Follow
CAENVIRONMENT
1,301 followers | Follow
The Ocean Registry
Discover & protect our world's oceans and waters at TheOceanRegistry.com!1,211 followers | Follow
Angela Kim
Multimedia journalist, Social Media Editor at Yahoo!, former public radio producer, food blogger, shutterbug, wanderluster... Opinions here are my own.1,168 followers | Follow
Forest Service R1
Stay updated on what's happening in the Northern Region of the Forest Service. Disclaimers: http://www.fs.fed.us/disclaimers.shtml956 followers | Follow
Patagonia San Fran
The gang at Patagonia San Francisco is now on Twitter. Get news about our store, our team, our products and local environmental causes.827 followers | Follow
Patagonia Palo Alto
We opened on July 18 2007, and we are stoked to be a member of the Patagonia Family!776 followers | Follow
Wildlife Protection
Wildlife Protection Network educates the public about animal intelligence and the scientific, humane treatment of wildlife. http://www.edu-cyberpg.com721 followers | Follow
SFConservatory
The Conservatory of Flowers is a unique living museum that's bursting with life just waiting to be discovered.719 followers | Follow
Pulse of the Planet
Two-minute sound portraits of planet Earth, reaching listeners worldwide via radio and online. Presented by the National Science Foundation.572 followers | Follow
Open Space Council
We are a collaboration of nonprofits, public agencies and special districts who care about parks, trails, farms, ranches, and open spaces in the Bay Area.558 followers | Follow
Toni: En Plein Sight
En Plein Sight: supporting plein air painting & the art of land conservation in the Sierra Nevada Foothills551 followers | Follow
Green Energy
Updates on toxic coal waste that is being put in products without testing or labeling. Seeking a green energy future!543 followers | Follow
RemoteSensingIce
The Center for Remote Sensing of Ice Sheets aims to predict the response of sea level change to the mass balance of ice sheets in Greenland and Antarctica.532 followers | Follow
NCAR HIPPO
This study is the first time scientists have attempted to systematically map global distribution of carbon dioxide and other greenhouse gases in the atmosphere.509 followers | Follow
Amanda McKenzie
501 followers | Follow
Pine Island Glacier
I'm the Pine Island Glacier (PIG) and ice shelf in Antarctica. I'm melting. See also http://twitter.com/mankoff468 followers | Follow
Humboldt Baykeeper
Humboldt Baykeeper works to safeguard our coastal resources for the health, enjoyment, and economic strength of the Humboldt Bay Community.450 followers | Follow
Oil Spill Commission
The Twitter account for the National Commission on the BP Deepwater Horizon Oil Spill and Offshore Oil Drilling.426 followers | Follow
Dr. James Lovelock
Please tweet questions to @globalbrainx108 so your inspiration can be followed...413 followers | Follow
KQED QUEST
A KQED Multimedia Series Exploring Northern California Science, Environment and Nature.345 followers | Follow
Chad A Stevens
A Thousand Little Cuts (formerly The Coal War): one mountain destined to be destroyed by the coal industry and the courageous fight to save Coal River Mountain.256 followers | Follow
Extreme Ice Survey
222 followers | Follow
Teresita Cochran
Exeter, RISD, NYU-ITP alum, mama of boys: daxton + phinean, sustainable design start-up co-founder and happily married!193 followers | Follow
EcoMetro Guide
Local green living info and coupons for the Silicon Valley and Santa Cruz - NOW @ChinookBookBAY - Please follow us there!171 followers | Follow
Sustainable Sailing
Go green when you cast off. Learn about clean technologies and beneficial behavior140 followers | Follow
CA Trails Conference
CA Trails & Greenways Conference is a forum for educ, networking, planning, funding, designing, constructing, & managing non-motorized recreation trails in CA.128 followers | Follow
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