San Diego is 12th greenest city

Of the nation's 100 largest cities, San Diego is the 12th greenest, according to WalletHub, an organization that keeps statistics on states, cities, and metro areas.

The cities were ranked on variables such as: air and water quality, greenhouse gas emissions per capita, percentage of land devoted to green space (such as parks), percentage of people who walk or bike to work, relative fuel consumption, percentage of electricity from renewable sources, relative number of farmers' markets, and relative number of jobs in green energy.

San Diego ranked third in green lifestyle and enlightened policies such as number of local programs for promoting green energy, green jobs and farmers' markets per capita.

New York City comes in first, helped along by the relatively low number who drive to work, and the high number that walk or bike to work. Portland, Oregon, a famously environmentally advanced city, comes in second and San Francisco third. In last place is Baton Rouge, Louisiana.