Why 350 ppm?

If you have been involved or informed on climate change, then you have heard that the magic number is 350 ppm (parts per million of CO2). If you haven't heard this yet, then this is your introduction to it and why it is such an important number.


"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."

I highly recommend visiting 350.org and seeing how people all over the globe are rallying around the mission to reach 350 ppm.