Pay your bills online and save a tree and 42 cents on postage.

在线支付你的帐单，这样能挽救一棵树并能省下42美分的邮费。

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Save a tree... please don't print this email unless you really need to.

拯救一棵树…请不要打印这电子邮件除非您真正需要。

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On a paper document (save a tree, send E-mail) it's typical to close the document with the following.

在纸质文档(保护树木，请用电邮)的末尾，使用手工签名是一种常见的做法，如下所示。

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For now, non-iOS users must load their tickets though a mobile site in order to save a tree or two.

ENGADGET: Amtrak readies conductors to trade in their hole punchers for iPhones

To save the fast-disappearing forests, Parliament in 1581 passed a bill to forbid tree-cutting within 22 miles of the Thames, 3 miles of the coastline and 4 miles of the Sussex forests.

FORBES: Magazine Article

Endangered tree snails are being bred in a Hampshire zoo in an attempt to save them from extinction.

BBC: Partula tree snail