Environment

• Meridian Health Foundation
  promotes healing, in both the individual and the environment, through education, the delivery of preventative and supportive health services and the arts.
• Sea Shepherd Conservation Society
  Engages in various demonstrations, campaigns, and tactical operations at sea and elsewhere, including conventional protests and what it calls direct actions to protect marine wildlife.
• UNEP – the Billion Tree Campaign
  a worldwide tree planting initiative facilitated by the United Nations Environment Programme
• Waterkeeper Alliance
• World Wide Fund for Nature
  (previously known as: World Wildlife Fund)
• World Wide Fund for Nature (WWF)
  an international non-governmental organization working on issues regarding the conservation, research and restoration of the environment.

(these are just some random organizations. There are many, many more out there…)