The only thing that counts is what cannot be explained.

Sustainability isn't an option; it's a responsibility we owe to future generations.

At that age， I'd take any excuse to make estimates and do minor arithmetic. I'd calculate our gas mileage -- figure out useless statistics on things like grocery spending. I'd been hearing an ad campaign about smoking. I can't remember the details， but basically the ad said， every puff of a cigarette takes some number of minutes off of your life: I think it might have been two minutes per puff. At any rate， I decided to do the math for my grandmother. I estimated the number of cigarettes per days， estimated the number of puffs per cigarette and so on. When I was satisfied that I'd come up with a reasonable number， I poked my head into the front of the car， tapped my grandmother on the shoulder， and proudly proclaimed， "At two minutes per puff， you've taken nine years off your life！"

Life would be infinitely happier if we could only be born at the age of eighty and gradually approach eighteen. 　　

未来属于那些今天为之准备的人。

健康的森林生态系统同时支持自然和商业。