One funny story. Translated from Estonian (may be not very well). Originally posted to local news site Minut (means "a minute") by someone. Story URL: http://www.minut.ee/article.pl?sid=03/04/12/2328257 Humanity is endeavor of Greenery ------------------------------------ Milliards years ago, Earth's atmosphere was enriched with carbon dioxide. Green life used it, at first endless source of carbon, to keep itself alive, until it's gone and replaced with oxygen pollution. And precious carbon was buried to deep depths, where it was unreachable. Greenery then took all it's will to clean out oxygen from air and re-establish carbon in atmosphere. That expresses in human, whose mission is to dig out all the carbon and burn it (oil, gas, coal and other fossil fuels). Whole operation takes only a moment in Earth's history: Nowadays air contains 21% of O2 and 0.038% or CO2, which only a 100 years ago was 0.028%. Today we add 68 million tons of CO2 per day, now total of 850 milliard tons during last two centuries. (data taken from: www.gcsechemistry.com)