350 is the red line for human beings, the most important number on the planet. The most recent science tells us that unless we can reduce the amount of carbon dioxide in the atmosphere to 350 parts per million, we will cause huge and irreversible damage to the earth.

Facts about the climate crisis

Environmental issues and news

Zipcode based toolfinder for parks and trails

a regional land trust that conserves land and protects wildlife habitat in the Concord, Assabet, and Sudbury river basin for the benefit of present and future generations.

Graphical view