Jane loves driving her gas-guzzling, carbon-dioxide-emitting rolls-royce phantom. she also would like to live in a world without climate change and she believes carbon dioxide in the atmosphere is causing climate change; thus, she believes she and the world would be better off if total carbon dioxide emissions are reduced. however, she knows that her own individual contribution, as large as it is, does not itself affect the climate and, besides, she would rather let others bear the burden of reducing overall carbon dioxide emissions. if others bear the burden, jane reasons, she will enjoy a world without climate change and still get to drive her phantom. it's a win-win for jane!