The amount of carbon dioxide in the atmosphere has crossed the "psychological threshold" of 400 parts per million. That number is one of the clearest measures of how humans are changing the planet by burning fossil fuels.
Source: http://www.npr.org/2013/05/10/182029983/dangerous-territory-carbon-dioxide-levels-reach-iconic-high?ft=1&f=1007
Bonsai Tree Boomerangs Bowling Brewing Beer Bridge Building
Brak komentarzy:
Prześlij komentarz