Mayor Gavin Newsom made history in late 2007 when he triumphantly declared that his city's departments would be the first in the nation to pay a local carbon tax for all official air travel. The levy, set two years later at 13 percent of the price of a fare, would finance a city-run "carbon fund," Newsom said. The fund would help cool the planet by investing in local green initiatives that sucked some of the jets' greenhouse gas emissions... More >>>