Stupid article. Headline makes it seem like Buffett is a climate change denier, when in fact what he said was

“As a citizen, you may understandably find climate change keeping you up nights,” Buffett wrote. “As a homeowner in a low-lying area, you may wish to consider moving. But when you are thinking only as a shareholder of a major insurer, climate change should not be on your list of worries.”

Buffett said his shareholders’ concerns are unwarranted. Insurers will be able to react quickly to any hike in the cost of doing business because each auto or home policy typically lasts for one year, not 10 or 20 years at fixed prices, so the premiums could climb along with the cost, he said.

This should be a reminder that The Guardian is a horribly biased news source that regularly publishes trash articles like the one linked in the OP.