The ride-hailing companies have for years touted their services as alternatives to car ownership that could help reduce traffic, car accidents, and emissions. But as the popularity of the services grew, the companies instead worsened congestion in many cities, in some cases accounting for more than 13% of vehicle miles traveled, according to a 2018 study commissioned by the companies. With a large majority of drivers using gas-powered cars, more vehicle miles traveled means more greenhouse gas emissions.  

https://fortune.com/2021/06/22/uber-lyft-sustainability-covid-pandemic/