Called a practical environmentalist, Michael Regan has experience dealing with state agencies and is expected to tackle climate change and environmental justice.
If the Senate stays under Republican control, it would likely prevent sweeping climate legislation, and progressive cabinet nominees. But there's a lot Biden could do in the executive branch.
Analysts say exiting the landmark climate agreement is not only a blow to climate action, but hinders the U.S.'s ability to participate in the economics of the future.
