These organizations use tactics varying from direct action to job training, but they all are working to protect the planet in a substantial way.

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Through twitter, anyone can stay up to date with their latest efforts to restore and protect habitats, influence environmental policy, and curb climate change. Take the opportunity to tap into the thoughts of those pushing for change and perhaps find some ideas of how you can help.

In alphabetical order:

AIDG – @aidg

Alliance for Climate – @ClimateEd

Alliance to Save Energy – @ToSaveEnergy

Amazon Watch – @AmazonWatch

Animal Aid – @AnimalAid

Bikes for the World – @bikesftworld

Blue Planet Society – @Seasaver

Camp for Climate Action – @ClimateCampLdn

Chesapeake Climate Action Network – @CCAN

Clean Air Conservancy – @CleanAirConserv

Clean Air Georgia – @CleanAirGA

Climate Cycle Africa – @ClimateCycle

Climate Rescue – @ClimateRescue

Conservation NW – @ConservationNW

Defenders of Wildlife – @Defenders

Earth Hour – @earthhour

Earth Institute – @earthinstitute

Earth Island Institute – @EarthIsland

Earthjustice – @Earthjustice

Earth Share – @EarthShare

ECO Canada – @ecocanada

Ecojustice – @Ecojustice_ca

Eco Preservation Society – @EcoPreservation @EcoInteractive

Endangered Species Coalition – @stopextinction

Environmental Defense Fund – @EnvDefenseFund

Farm Animal Rights Movement – @FARMUSA

FarmForward – @FarmForward

Farm Sanctuary – @FarmSanctuary

Food & Water Watch – @Foodandwater

Forest Ethics – @ForestEthics

Friends of the Earth – @wwwfoecouk @foe_us

Global Green USA – @globalgreenusa

Go Sustainable – @gosustainable

Greener Leith – @greenerleith

Green For All – @GreenForAll

Greenpeace – @Greenpeace @Greenpeace_Intl @GreenpeaceUSA

Healthy Child Healthy World – @healthy_child

Hawk Conservancy – @HawkConservancy

Heal the Bay – @HealtheBay

Humane Society of the United States – @HumaneSociety

Institute for Sustainable Communities- @SustainableComm

International Elephant Foundation – @IEF_elephants

Just Green – @Just_Green

Kiva – @Kiva

LCA Trust – @preserveland

Liberation BC – @liberationbc

Live Earth – @LiveEarth

National Park Foundation – @GoParks

National Wildlife Federation – @NWF

Natural Resources Defense Council – @NRDC @NRDCswitchboard

Nature Conservancy – @nature_org

Nature New South Whales – @naturensw

Northwest Earth Institute – @nwearth

Ohio Wildlife Rehab – @OWRA

Oregon Wild – @OregonWild

Pacific Forest Trust – @PacificForest

Rainforest Action Network – @RAN

Rainforest Alliance – @RnfrstAlliance

Rainforest Rescue – @SaveRainforests

Royal Society for Protecting Birds – @Natures_Voice

RSPCA – @RSPCA_official

Save Our Rivers – @SaveOurRivers

Save the Frogs – @savethefrogs

Sierra Club – @Sierra_Magazine

Sierra Club Great Lakes – @SC_Great_Lakes

Student Conservation Association – @the_sca

Surfrider Foundation – @SurfriderHQ @surfridereurope

Sustain US – @SustainUSAgents

The Australian Conservation Foundation – @AusConservation

The Climate Project – @ClimateProject

The Model Forest Policy Program – @MFPP

The Wilderness Society – @Wilderness

The Wild Foundation – @WILDfoundation

Trees, Water & People – @treeswater

Urban Land Institute – @UrbanLandInst

Vegan Outreach – @VeganOutreach

WA Wilderness – @Wa_Wilderness

Wildfowl and Wetlands Trust – @wwtlondon

World Wildlife Fund – @World_Wildlife

1planet1ocean – @OceanDoctor

1Sky – @1Sky

This will be most useful as a comprehensive list, so please let me know if I missed any by sending me a tweet @AFelsinger.

Photo via Muffet on Flickr under Creative Commons license.