They’re transforming cities with million-dollar views and a message of modernity. But climate change makes cooling them tricky and costly.

The maker of Claude is on the verge of what could be the largest ever public listing, in a test of the A.I. industry amid questions about whether the boom can be sustained.

President Luiz Inácio Lula da Silva triumphed over Flávio Bolsonaro, the eldest son of the right-wing leader he defeated four years ago.