高手帮我看看这些英语句子有没有错误，或者可以改进的地方好吗

1.There is something invisable but vital in the earth we lived on , that is the atmosphere. 合并语句

2.Over the last few decades, the changes of atmosphere seriously damaged the ecological balance on the planet.
原句中一个单词错了，应该是destroyed.我本人觉得demaged更贴切。

3.Besides these changes, the more serious ……
4.这句没问题。

5.Now we have the subjective cognition about it,but what is the exact carbon dioxide content objectively ?

There's an invisible substance which is vital to the earth we're surviving on - the atmosphere.

During these decades,the change of the atmosphere largely destoried the balance of the environment. 这句可以（注意拼写 decades）

Something more serious 这句也行（注意拼写）

All of these phenomena are caused by global warming. 完全可以。

Now that we have a subjective impression of it, what on earth is the exact CO2 cotent in the air?