‘Just an unbelievable amount of pollution’: how big a threat is AI to the climate?

Defenders say AI can do good to fight the climate crisis. But spiralling energy and water costs leave experts worried

During a golden sunset in Memphis in May, Sharon Wilson pointed a thermal imaging camera at Elon Musk's flagship datacentre to reveal a planetary threat her eyes could not. Free from pollution controls, the gas-fired turbines that power the world's biggest AI supercomputer were pumping invisible fumes into the Tennessee sky.

It was jaw-dropping," said Wilson, a former oil and gas worker from Texas who has documented methane releases for more than a decade and estimates xAI's Colossus datacentre was spewing more of the planet-heating gas than a large power plant. Just an unbelievable amount of pollution."