The sentence: Rainforests help to control global warming because they absorb carbon dioxide could be rewritten, without change of meaning, as:
As rainforests absorb carbon dioxide, they help to control global warming.
Rainforests help to control global warming. Thus they absorb carbon dioxide.
Rainforests help to control global warming hence they absorb carbon dioxide.
Rainforests absorb carbon dioxide whereas they help to control global warming.
In spite of rainforests absorb carbon dioxide, they help to control global warming.
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