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As carbon dioxide and various other greenhouse gases increase in the atmosphere, there are serious concerns that a major global warming will happen in the near future. |
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The increase of carbon dioxide and other greenhouse gases in the atmosphere are causing concerns about a much more serious global warming that may occur in the years ahead. |
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Because of the increase of carbon dioxide and various other greenhouse gases in the atmosphere, a great deal of serious concern is expressed about a major global warming that may happen in a few years. |
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There are many concerns that a very serious global warming will occur in the years ahead owing to the increased carbon dioxide and various other greenhouse gases in the atmosphere. |
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Since carbon dioxide and many other greenhouse gases have increased in the atmosphere, there is a great deal of serious concern about the possibility of a major global warming in the near future. |