米国が世界最大の天然ガス輸出国に：シェール革命がもたらした4兆ドルの経済効果
米国が世界最大の天然ガス輸出国になった背景には「シェール革命」による水圧破砕法や水平掘削技術の進歩がある。2007年以降、米国内のガス価格は欧州や日本と比べて急激に低下し、これにより2007年から2025年までの累計で約3.1兆〜4.3兆ドル（1人当たり年間500〜700ドル）の経済的節約がもたらされた。NBERの最新論文がこの変革の恩恵を定量化している。
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