Some plants' pores can tighten to save water during conditions of high carbon dioxide.

VOA: special.2010.01.26

In fact, if the other person is working hard, or is cutting back on their carbon emissions, you have every bit more incentive to not work hard or to keep high carbon emissions yourself.

实际上,如果其他人正在努力工作,或者正在尽量减少碳排量,你总会有想偷懒的动机,或者总是继续大量排碳

耶鲁公开课 - 博弈论课程节选

You can talk about it as much as you like, but as long as you're going to go home and still drive your Hummer and have sixteen hot showers a day, we're still going to have high carbon emissions.

你可以在减排问题上一直高谈阔论,但当你回家时,你仍然会开着你的悍马,每天洗十六次热水澡,我们依然在大量排碳

耶鲁公开课 - 博弈论课程节选