President Biden launches a climate change virtual summit with dozens of world leaders and makes a new pledge: cutting carbon emissions in the U.S. by as much as 52% by 2030. 

Plus, the CDC director says the hard work now begins in convincing those still hesitant to get the covid-19 vaccine.

And Colorado passed a police reform bill last year, including some limits on police officers' qualified immunity in civil cases. Could it serve as a model for legislation being negotiated now in Congress?

On today's program: CNN's Kaitlan Collins, Manu Raju, Miguel Marquez, and Ryan Nobles. Also on the show: Earth scientist Rob Jackson, POLITICO's Laura Barrón-López, epidemiologist Caitlin Rivers and Colorado Attorney General Phil Weiser.

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