Do innumerate hippies run the San Francisco airport? Sign there proudly proclaims that SFO's 2,200 trees remove 121 tons of CO2 from the air each year

If you believe that CO2 is the primary climate driver, and if you believe that slightly warmer weather is a bad thing, and if you believe that these trees will never die, and if you believe that the Chicago Climate Change correctly valued CO2 emissions at a nickel per ton, these trees are providing a total of almost 12 cents worth of avoided CO2-induced bad weather each week!

Twitter / cgiller: Sign at SFO made me laugh, ...

Sign at SFO made me laugh, sadly. Proud proclamation of offsetting what amounts to half the CO2 from 1 x-country flight pic.twitter.com/MBZ0TBn2