Five years after virtually every world leader agreed to “phase down” the burning of coal for climate reasons, the fuel is more widely used than ever.

© Ahmad Mulia Panjaitan/Associated Press

The state is considering extending the life of its last nuclear power plant, Diablo Canyon, and allowing construction of new reactors to help meet its clean energy goals.

Today we visit Pennsylvania, where there’s a high-stakes clash over A.I. jobs and the environment.

© Kristian Thacker for The New York Times