350.org (10/10/10 Global Work Party)

in many languages

  • 350.org is an international campaign that’s building a movement to unite the world around solutions to the climate crisis—the solutions that science and justice demand.
  • Our mission is to inspire the world to rise to the challenge of the climate crisis—to create a new sense of urgency and of possibility for our planet … (full text Mission).

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Submit a report; Press; Join; Donate; FAQs; Campaigns: Great Power Race, Put Solar, Earth Art;
Contacts online.

About 350 Science: 350 parts per million is what many scientists, climate experts, and progressive national governments are now saying is the safe upper limit for CO2 in our atmosphere.  

Accelerating arctic warming and other early climate impacts have led scientists to conclude that we are already above the safe zone at our current 388ppm, and that unless we are able to rapidly return to below 350 ppm this century, we risk reaching tipping points and irreversible impacts such as the melting of the Greenland ice sheet and major methane releases from increased permafrost melt.

There are three numbers you need to really understand global warming, 275, 388, and 350.

For all of human history until about 200 years ago, our atmosphere contained 275 parts per million of carbon dioxide. Parts per million is simply a way of measuring the concentration of different gases, and means the ratio of the number of carbon dioxide molecules to all of the molecules in the atmosphere. 275 ppm CO2 is a useful amount—without some CO2 and other greenhouse gases that trap heat in our atmosphere, our planet would be too cold for humans to inhabit.

Beginning in the 18th century, humans began to burn coal and gas and oil to produce energy and goods. The amount of carbon in the atmosphere began to rise, at first slowly and now more quickly. Many of the activities we do every day like turning the lights on, cooking food, or heating or cooling our homes rely on energy sources like coal and oil that emit carbon dioxide and other heat-trapping gases into the atmosphere. We’re taking millions of years worth of carbon, stored beneath the earth as fossil fuels, and releasing it into the atmosphere. By now—and this is the second number—the planet has about 388 parts per million CO2 – and this number is rising by about 2 parts per million every year … (full text).

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