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According to evolutionary reasoning, some tropical trees will still be able to photosynthesize in tropical regions. Those will become the dominant species.

It will be the same order of business for all life on a warmer earth. Will humans thrive? Perhaps not. But some species will thrive.

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> some tropical trees will still be able to photosynthesize in tropical regions. Those will become the dominant species.

Unless the environmental changes happen too fast for adaptation to keep up with--the tree of life can have dead ends.

Not necessarily adaptation. It may be a selection and reduction of existing biodiversity.

Right. What "reduction in biodiversity" means is that some species will adapt fast enough and some won't. Unfortunately, there is no lower limit to "reduction in biodiversity".

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