Dozens of countries met this week to discuss how to end the world’s dependence on fossil fuels, a goal that the Trump administration doesn’t share.

Photographs from the first days of the Chernobyl disaster and of the aftermath years later show the response, the evacuation and the long-term consequences of the world’s worst nuclear accident.

President Trump withdrew from the Obama-era nuclear accord in 2018, saying it was the worst deal ever. But Iran responded with an enrichment spree that haunts the negotiations to this day.

Pedro Sánchez, Spain’s prime minister, said the nation’s renewable energy system has softened the financial fallout from the war in Iran. The story is more complex.

Strikes on Ukrainian energy systems have tripled this winter. Continuous repairs and Western aid staved off a total breakdown.