April 22^nd is the World Earth Day．The earth is our motherland．It has been here for 4.6 billion years，while mankind has been around for just a few millions years．
    But now，this blue planet gets into trouble．Many rain forests are disappearing．A lot of wild animals are killed．（1）全世界越變越暖。Why？We put tons of preen gas（溫室氣體）into the air，which leads to global（全球的）warming．Each day，seventy-five kinds of animals and plants are disappearing．The earth is crying!We need to take action to solve these serious problems．
    So what can we do to protect our planet？（2）It's necessary for us to plant more trees instead of cutting them down．What transportation do you usually take when you go out？If it's not far，would you mind walking or riding a bike？Saving water and reusing（重復(fù)利用）things are also good ways．Do remember to turn off the lights and appliances（電器）when you go out!Do you know Earth Hour？At 20：30 p．m．on the last Saturday of March，there is an activity to help protect our earth．It's called Earth Hour．（3）People turn off all the lights and appliances so that our earth can take a break for one hour．
    Of course，there are many other things we can do to help．So，think about a question．Do you live an environmental-friendly life？If not，（4）為什么不學(xué)著去過一種簡單的生活呢？
    The best time to act was yesterday and the second best time is today．Let's take action now．（5）Every little thing we do today will make a great difference to the future．
（1）

The world is getting warmer and warmer.

The world is getting warmer and warmer.

（2）

種更多的樹而不是砍樹對于我們來說是必要的。

種更多的樹而不是砍樹對于我們來說是必要的。

（3）

人們關(guān)閉所有的燈和電器，以便我們的地球可以休息一小時(shí)。

人們關(guān)閉所有的燈和電器，以便我們的地球可以休息一小時(shí)。

（4）

Why not learn to live a simple life？

Why not learn to live a simple life？

（5）

我們今天做的每一件小事都會(huì)對未來產(chǎn)生巨大的影響。

我們今天做的每一件小事都會(huì)對未來產(chǎn)生巨大的影響。