Imprescindibles
Pete Cashmore
The largest independent website dedicated to news & resources for the connected generation. Tweets from @mashable staff. Send questions/comments to @mashablehq.2,879,520 followers | Follow
BBC News (World)
The latest stories, features and updates from BBC News (World edition). For UK edition, follow @BBCNews. For breaking news, follow @BBCBreaking2,028,387 followers | Follow
National Geographic
Since 1888, we've traveled the Earth, sharing its amazing stories with new generations. Official Twitter account of National Geographic.1,906,846 followers | Follow
UN Refugee Agency
The official account of UNHCR. Follow us as we provide vital aid and protection to the forcibly displaced around the world (@AlexandraKE tweeting)1,220,322 followers | Follow
United Nations
Official twitter account of United Nations. Get the latest information on the UN.871,684 followers | Follow
New Scientist
New Scientist is the world's leading science and technology weekly. http://www.facebook.com/newscientist561,693 followers | Follow
Greenpeace
We're an independent global campaigning organisation acting to change attitudes and behavior, to protect the environment and promote peace.490,841 followers | Follow
AmnestyInternational
We've been fighting the bad guys since 1961 - you can join us! Get the latest #humanrights news and actions. Official Amnesty International USA profile.437,294 followers | Follow
Cesar Millan
My whole life dogs followed me. Growing up poor in Mexico, people called me el perrero— the dirty dog boy. Now the world knows me as The Dog Whisperer.425,802 followers | Follow
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-involved282,416 followers | Follow
National Geographic
Follow us for the latest on what's happening at the National Geographic Channel in the U.S. Questions and comments welcome!220,159 followers | Follow
TreeHugger.com
Links, Ideas and Conversation from the TreeHugger hive mind, the latest in modern green.169,607 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.157,856 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 @julkosch95,524 followers | Follow
UNICEF USA
21,000 children die every day from preventable causes. We believe that number should be zero. Do you believe in ZERO?81,863 followers | Follow
MotherNatureNetwork
Environmental news, local foods, innovations, and green inspiration53,153 followers | Follow
WWF Climate Savers
Finding workable, practical solutions to the problems posed by Climate Change and Global Warming.48,694 followers | Follow
NOAA's Ocean Service
NOAA's National Ocean Service is the nation's premier federal science agency for oceans and coasts.44,323 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.42,855 followers | Follow
Chris Ingham Brooke
For environmentalists who don't take themselves too seriously29,755 followers | Follow
RayBeckerman
Law, social justice, nature, human & animal rights, the arts, ecology. Progressive. I try to lend my voice to the voiceless. http://is.gd/cNFKN22,406 followers | Follow
Rescue Animals
We are dedicated to celebrating rescued animals, supporting shelters, rescues and animal rights groups and to animal welfare worldwide.21,673 followers | Follow
Genaro Lozano
Politólogo e Internacionalista. Escribo en Grupo Reforma. Analista político en CNNMex. Subdirector @ForeignAffairsL Fotógrafo, restaurantero en @sanblasmariscos19,139 followers | Follow
Placebo Effect
We make it easier for friends to give friends the gifts of JOY, LOVE, HEALTH, HOPE, and SERENITY18,908 followers | Follow
UN Climate Change 09
United Nations Climate Change Conference 2009 in Copenhagen (COP15), brought to you by the Ministry of Foreign Affairs of Denmark18,666 followers | Follow
WSPA International
The World Society for the Protection of Animals (WSPA) vision is a world where animal welfare matters and animal cruelty ends.18,385 followers | Follow
Defenders Wildlife
Defenders of Wildlife leads the pack when it comes to protecting wild animals and plants in their natural communities.18,110 followers | Follow
Earth Day Network
Take part in Billion Acts of Green: visit http://act.earthday.org/.18,084 followers | Follow
Jonathan Wilson
Helping children after trauma through / art / story / games / play / song / dance / film / love / hope / people who care.16,793 followers | Follow
Enivronment Updates
Get a worldwide survey of scientific and political environmental news. Re-tweet if you want.16,077 followers | Follow
Wilderness Society
The Wilderness Society works for clean energy and America's forests, national parks, refuges and BLM public lands.15,479 followers | Follow
United Nations DSD
United Nations Division for Sustainable Development promotes & is a source of expertise on sustdev in the UN9,833 followers | Follow
Leslie Quigley
treehugging, feminist, hippie mama, wifey, domesticated eco gal and urban gardener! nature, health foodie, + yoga addict. peace, love & green happiness :)9,552 followers | Follow
Big Cat Rescue
Providing permanent home to 100+ lions, tigers & wild cats. Ending the breeding, trade, use and abuse w/ better laws at CatLaws.com9,375 followers | Follow
Roz Savage
Ocean Rower, Author, Motivational Speaker, Environmental Campaigner9,356 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.9,151 followers | Follow
End Water Poverty
We campaign against the global water and sanitation crisis. Make your voice heard through End Water Poverty. Tweets by Jen, Sarah and Olivier.8,587 followers | Follow
Greenfudge.org
Environmental News with a Sticky Twist: Environmental News, Environment, Nature, Green living, Oceans, Animals, Universe, Green Network, Weird, Wonderful...8,584 followers | Follow
Sussex Wildlife
Sussex Wildlife Trust is the leading wildlife and landscape conservation charity in East Sussex, West Sussex and Brighton. Tweets by Richard.8,423 followers | Follow
Caroline // RSPCA
Caroline at RSPCA Australia bringing you news and answering your Qs about the RSPCA and animal welfare.8,309 followers | Follow
American Humane
The nation's voice for the protection of children & animals... we are your voice.7,725 followers | Follow
Henricus Peters
Making connections - #Children & #Nature, #Scouting, #EnvironmentalEducation and #Sustainability. #Playoutdoors. Also at @NAEE_UK. Fuller discussions at7,490 followers | Follow
Marisa Herrera
Animal & Nature advocate, Animal Communicator, Animal Reiki Practitioner, vegan, sustainable living.7,285 followers | Follow
John Peter Thompson
Ask me your questions - Sustainability, ecosystems invasive species,natural philosophy, history, politics & current events explained7,053 followers | Follow
Service Dog Registry
We are a free, voluntary, non-governmental, privacy-conscious and secure registry designed to promote community-defined training and behavior standards.6,840 followers | Follow
Pete Adoption
Gathering information and resources about animal rescue and pet adoption.6,833 followers | Follow
Nature Canada
Meet our team! The people at Nature Canada are bringing you the inside scoop and latest updates on our conservation, outreach and advocacy work.6,763 followers | Follow
Care2 Action Alerts
Care2 Action Alerts - make a difference online with Care2.com and ThePetitionSite.com!6,748 followers | Follow
Ocean Champions
The only political voice for the ocean. We help elect pro-ocean candidates & work with them to drive great ocean policy. Tweets from Mike, Chris & the crew.6,623 followers | Follow
WSPA Canada
Our vision: A world where animal welfare matters and animal cruelty has ended. Visit www.wspa.ca to join our fight to end animal cruelty.6,164 followers | Follow
WSPA - USA
WSPA is an international animal welfare organization. Our vision: A world where animal welfare matters and animal cruelty has ended.5,879 followers | Follow
WSPA Campaigners
Official HUMANE CHAIN feed for those who want an end to the cruel live animal export trade. Help stop live export; be a link in the Humane Chain.5,693 followers | Follow
New England Aquarium
Founded in 1969, the New England Aquarium is a global leader in ocean exploration and marine conservation.5,441 followers | Follow
PataPirata
Proveemos información sobre animales domésticos. Cómo rescatarlos, conseguirles casa, cómo vivir con ellos sin volverse locos. www.facebook.com/PataPirata5,431 followers | Follow
RainforestSOS
Working with governments, business, NGOs and individuals to increase global recognition of the contribution of tropical deforestation to climate change5,312 followers | Follow
AskNature (Official)
AskNature is an online inspiration source and social networking tool for the biomimicry community.5,184 followers | Follow
UNICEF Costa Rica
UNICEF se guía por la Convención sobre los Derechos del Niño esforzándose porque esos derechos se conviertan en principios éticos perdurables para niños y niñas4,760 followers | Follow
Shelly Skoog-Smith
Let's prevent animal cruelty & neglect! I will post animal welfare, rescue & environmental info & petitions. Dog mom of 3, crafter, jewelry designer, editor. ☮♺4,613 followers | Follow
Care2Causes
Keep up to date on the causes you care about most with stories from Care2's network of bloggers and non-profit partners.4,433 followers | Follow
Friend a Gorilla
4,087 followers | Follow
Turtle Trauma Centre
Kawartha Turtle Trauma Centre (KTTC) is a licensed rehabilitation centre and hospital for Ontario's turtles. It is a registered charity3,798 followers | Follow
WSPA Latinoamerica
Sociedad Mundial para la Protección Animal La WSPA trabaja por un mundo donde el bienestar animal importe y la crueldad hacia los animales haya terminado.3,530 followers | Follow
Conservation NW
We're keeping it wild in the NW. Join us as our staff member Jasmine Minbashian stars this year in BBC's #LandoftheLostWolves, on BBC/Discovery!3,261 followers | Follow
I'm Tired Of...
Raising money for the world's most important causes in a unique way. What are you tired of?3,242 followers | Follow
Child Soldier Relief
The mission of Child Soldier Relief (CSR) is to advocate on behalf of child soldiers by serving as a central repository of information relating to the topic.3,125 followers | Follow
UberCat: Agent 9D9
Welcome to Scratchtown. It's time to expand this one-dog, one-cat town into a world class destination for Pet Lovers. All followers welcome. We'll follow back!3,111 followers | Follow
Care2Healthy
Care2's Healthy Living was thousands of ways to enhance your life, including food & recipes, health & wellness, a healthy home and pets.3,063 followers | Follow
350.org MediaRoom
Breaking news on 350.org and climate change alongside dispatches from the grassroots climate movement.2,293 followers | Follow
Last Chance Pets NY
Can you help these pets find their forever homes? It's now or never. We are about one thing only - saving lives! (We are a sub-twitter of @LastChancePets)1,928 followers | Follow
Sofia Goncalves
Animal lover, vegetarian, helping spread the word. I follow all animals lovers. Always RT the most importants ones. Plz help...1,898 followers | Follow
Lost & Found Pets IE
Using social petworking to reunite lost dogs, cats and other pets with their owners in Ireland. Please post listings via main site.1,872 followers | Follow
350 en Español
Únete al movimiento mundial que está inspirando al mundo a buscar soluciones a la crisis climática. #ConectaLosPuntos1,637 followers | Follow
Biomimicry Institute
Follow @AskNatureTweets for updates from the new Biomimicry 3.8 Institute!1,503 followers | Follow
Kate Redman
Marine mammalogist, cetologist, oceanophile, childfree, Potterhead, Ravenclaw & total geek. Used to ID dolphins for @CBMWC. Recently moved to Amsterdam.1,416 followers | Follow
Glowno Animal Asylum
Each animal has own story, sometimes very painful. Let’s help them to obliterate bad memories and let’s make them to have the basis to believe in human goodness1,375 followers | Follow
Crissie Chambers
Hi I'm Crissie my passion is working with dogs and lucky enough it is also my job1,314 followers | Follow
RedRover Team
Tweeting from RedRover, formerly United Animal Nations, a nonprofit that helps animals in crisis and connects suffering animals with people who care.1,237 followers | Follow
Clean Up the World
Clean Up the World inspires and empowers communities around the globe to clean up, fix up and conserve the environment.1,113 followers | Follow
Bear Creek Sanctuary
Non-profit exotic wildlife sanctuary in Barrie, Ontario. We rescue confiscated, zoo surplus & situationally at risk exotic animals. Twitter acct. by Dana.947 followers | Follow
Paola Lopez
This page is in connection to Animal Rescue Examiner. See link above.541 followers | Follow
PetAssistanceNetwork
Fighting the Homeless Pet Population by Helping Pets Keep and/or Find their Loving Homes.386 followers | Follow
Michael Von Hulsebus
I am committed lto creating a sustainable planet and fighting the proliferation of plastic via promotional power of reusable bags. Owner BagThePlanet.com107 followers | Follow
