“If Congress fails to enshrine key climate policies as federal laws, Biden’s Plan B includes executive orders and major regulations from the Environmental Protection Agency, the New York Times reported.
The problem is that executive actions aren’t an ideal substitute for federal laws, and may last only as long as Biden’s presidency. EPA regulation also “tends to lag [behind] the technological realities,” meaning it may only modestly nudge the economy in a new direction, Jesse Jenkins, an environmental engineering professor at Princeton University, told Vox. It’s also vulnerable to intervention by the Supreme Court.”
https://www.vox.com/22738414/democrats-manchin-climate-reconciliation-plan-b