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Today there are more than 7 million electric vehicles (EVs) in operation around the world, compared with only about 20,000 a decade ago. It's a massive change—but according to a group of University of Toronto Engineering researchers, it won't be nearly enough to address the global climate crisis.

"A lot of people think that a large-scale shift to EVs will mostly solve our climate problems in the passenger vehicle sector" says Alexandre Milovanoff, lead author of a new paper published today in Nature Climate Change.

"I think a better way to look at it is this: EVs are necessary, but on their own, they are not sufficient."

Around the world, many governments are already going all-in on EVs. In Norway, for example, where EVs already account for half of new vehicle sales, the government has said it plans to eliminate sales of new internal combustion vehicles altogether by 2025. The Netherlands aims to follow suit by 2030, with France and Canada to follow by 2040.