Millions of years ago the world use to be all carbon dioxide. Now its changed a hole lot now there is a lot of oxygen and nitrogen. But now that there is a lot of businesses that are changing all of that they are polluting a lot and that is switching it all around. Now there is more carbon dioxide and that's causing global warming.
I think we should be concerned because if there is not enough plants the carbon dioxide will have know were else to go and it will just float around. And there wont be enough oxygen for us to live on earth.
I think we can find a way not to pollute so much because it will help or enviorment a lot.
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