Uber is going public — what better time to talk about climate change?

Environmental groups are hoping to use Uber’s expected IPO next week to highlight the ride hail company’s contribution to climate change and rising carbon emissions. On Friday, the Sierra Club unveiled an ad campaign urging Uber and its rival Lyft to curb air pollution by switching to fully electric cars.The timing of the ad campaign is crucial: next week, Uber is expected to make its public market debut at an eye-popping valuation of $90 billion, making it the biggest IPO since Ali