Atmospheric carbon dioxide passes 400ppm
Not to sound like a broken record, but for the average American, $15/person/year will plant enough trees to offset all the CO2 released into the atmosphere by that person: <a href="http://shindyapin.tumblr.com/post/141034501197/climate-change-solution-simplified" rel="nofollow">http://shindyapin.tumblr.com/post/141034501197/climate-chang...</a><p>Why aren't we doing it? Because nobody is forcing us, and very few are doing it voluntarily.