With a total score of 75.64 , San Francisco ranks consistently highly , coming in first for lifestyle and policy , sixth for environment , 10th for transportation and 15th for energy sources . It has consistently been known as a key player in sustainability efforts , and was working towards green movements long before the recent increase in popularity . The city has green building practices , a kerbside composting program , and much more . More than half of the busses and light rails in the city ’ s fleet are zero emission and San Francisco is working towards hybrid diesel by 2020 . There is a current focus on sustainable food and there has been a substantial increase in the vegan movement that limits the consumption of meat .

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