LA Times: When Greg Nickels became Seattle’s mayor in 2002, global warming was hardly at the top of the municipal agenda. New York’s World Trade Center had been attacked, and officials had to figure out how to protect their own city from terrorism. Boeing was laying off 30,000 machinists, so there was the declining regional economy to deal with. Surely the federal government would worry about climate change. Then came the winter of 2004, when the Cascade Mountains snowpack was so …