- Sen. Joe Manchin often drew the ire of Democrats for blocking Biden's climate agenda.
- But Manchin managed to hold a blue seat in a red state, and was key to major climate legislation.
- His successor will almost certainly be a Republican and, likely, a worse climate ally.
Democratic Sen. Joe Manchin has often made headlines for thwarting President Joe Biden's climate change agenda — but climate activists will likely miss him when he's gone.