TED】キャサリン・ヘイホー。気候変動と戦うためにあなたができる最も重要なこと：それについて語る (The most important thing you can do to fight climate change: talk about it | Katharine Hayhoe) (【TED】Katharine Hayhoe: The most important thing you can do to fight climate change: talk about it (The most i