A NEW CIVILIAN CLIMATE CORPS has become a central progressive demand for the Democrats’ budget reconciliation package, and party leaders seem poised to go along. Climate groups and elected officials alike see it as a combination of several top priorities: a tangible response to climate change, a broad-based jobs program aimed especially at young people and people of color, and a test case for Franklin Delano Roosevelt-style populism that President Biden is so eagerly trying to emulate. Like the Depression-era Civilian Conservation Corps, it would employ Americans on climate-focused public-works projects like reforestation. But not all CCCs are created equal....