英文翻译 帮帮忙了

A few thousand years ago, grasslands and forests are all over on the earth. Now, everywhere is barren, and many places are slowing changing into grasslands.

注：翻译是翻译了，但是原文中有一个知识性的问题。前面的“草地”和后面的“草原”有什么区别？翻译成英语以后，两个词都变成了 grassland，就不好理解了。况且“草原”不是一种太差的生态环境，不知道楼主的原意是想表达什么，请补充。

Thousans of years ago. There were all Forest and Lawn. But now .they all disappear. Many places become grassland in gradually