'Like 190 moonshots': Weir analyzes Biden's climate promise.

President Joe Biden kicked off a virtual climate summit attended by 40 other world leaders by announcing an ambitious cut in greenhouse gas emissions as he looks to put the US back at the center of the global effort to address the climate crisis and curb carbon emissions.

At the White House summit, which is taking place over two days, Biden committed the United States to reducing its greenhouse gas emissions by 50%-52% below its 2005 emissions levels by 2030. While the goals are a part of the Paris climate agreement that Biden rejoined upon taking office, they are non-binding and the administration has not rolled out a plan on how the US will meet them. Officials said Biden and his team arrived at the final number in a meeting at the White House on Wednesday morning.

CNN's Bill Weir describes the challenges facing President Biden and why his vow is so ambitious.

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