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Artificial-intelligence evangelists such as Sam Altman want to reshape the world, but they need mountains of money to do it. Tech and power companies are raising cash every which way: issuing shares, loans and bonds on publicly traded markets and in private deals. Large firms, or hyperscalers, such as Amazon.com and Microsoft could easily spend about $3 trillion by 2030 to build and operate data centers for their businesses, according to BlackRock Investment Institute.