Forests are the lungs of the earth. Without them, it cannot breathe.
森林是地球的肺。没有森林，地球就无法呼吸。
It needs it's forests to remove carbon dioxide from the air and to make oxygen.
地球需要森林来消耗二氧化碳并产生氧气。
In many countries, such as New Zealand, Canada, and Brazil, forests were cut down to provide wood to build houses.
在很多国家，比如新西兰、加拿大、巴西，人们砍伐森林为建房提供木材。
Many young volunteers around the world are working in their holidays to plant new trees to replace them.
全世界有很多年轻的志愿者利用假期植树造林，替代被砍伐的森林。
These young men and women face many difficulties when they plant new trees.
这些年轻人在植树造林时面临着许多困难。
The weather may be very hot and dry or it may be very cold and wet.
天气可能又热又干，或者又冷又湿。
There are often many insects that bite these planters on their legs, arms, and faces while they work.
他们工作时，腿部、胳膊和脸部经常会被虫子咬。
They carry heavy bags of small trees, and working in the mountains can be dangerous.
他们需要背着装有树苗的沉重袋子，而且在山区工作会很危险。
Tree planters are changing the world.
植树者在改变着这个世界。
They plant different types of trees so that birds and animals can live in the forests.
他们种植不同种类的树木，让鸟类和动物们能在森林里生活。
Even though tree planting is very difficut, they love their work.
尽管植树困难重重，但是他们依然热爱自己的工作。
They believe that in 50 years their litte trees will because become forests.
他们相信50年以后，他们的小树苗都会变成森林。
