Ukraine violence escalated over the weekend and into Monday as pro-Russian militants clashed with Ukraine forces in the east and the Black Sea port city of Odessa. The threat of another natural gas shutoff intensified, too, with Russia and Ukraine failing to agree on terms for paying down Ukraine's gas debt.
The Supreme Court upheld a federal regulation Tuesday that limits the amount of air pollution that can cross state lines, handing a victory to the Obama administration's efforts to limit air pollution. The Supreme Court ruling deals a blow to the US coal industry, but the biggest hit is yet to come.
Energy Secretary Ernest Moniz visited Boston Tuesday to commemorate Earth Day at the New England Aquarium. Before heading to Fenway Park to throw out the first pitch at a Red Sox game, he sat down with the Monitor's David J. Unger to talk about the Ukraine crisis, oil exports, methane leaks, and his optimism about tackling climate change. Here are excerpts (edited for clarity):