WASHINGTON (AP) — World leaders welcomed the United States' official return to the Paris climate accord Friday, but politically trickier steps lie just ahead for President Joe Biden, including setting a tough national target in coming months for c...

WASHINGTON (AP) — Once a skeptic about climate change, Jim Bridenstine came around to the prevailing view of scientists before he took over as NASA administrator. That evolution did not sit well with a Trump environmental adviser, nor a think-tank an...