“Variations of gas bans have spread from liberal enclaves like Berkeley, Calif., and Brookline, Mass., to bigger cities, including San Jose, Calif., Seattle and Sacramento, as efforts to curb climate change increasingly take aim at the burning of gas as well as oil. What made the bill a harder sell in New York — where 40 percent of carbon emissions come from buildings — was winter.”

“San Francisco has become the biggest American city yet to ban natural gas in new buildings. Supervisor Rafael Mandelman, who wrote the legislation, says natural gas is responsible for 44% of the city's overall emissions and is responsible for 80% of building emissions.”