Carbon Counter/EVs: cleaner electricity makes a big difference to emissions
Lex专栏：电力清洁，电动汽车才环保

The power sources used to charge electric cars have to become greener
纯电动汽车本身并不能减少碳排，为其充电的电力来源也必须变得更加清洁。与汽油车相比，电动汽车在碳排方面的优势将越来越大。