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The world’s richest man unveiled a fund to help climate scientists and activists, an escalation of his philanthropic efforts. Jeff Bezos, Amazon’s chief executive and the world’s richest man, said on Monday that he was committing $10 billion to address the climate crisis in a new initiative he called the Bezos Earth Fund. The effort will fund scientists, activists and nongovernmental organizations, he said in a post on Instagram. Mr. Bezos, who has been pushed by Amazon employees on climate issues, said he expected to start issuing grants this summer.