How much of this is a result of legal issues and more detailed observations as well as the increased number of known species, many of which are probably "threatened" due to their small numbers.
Global warming would stand to increase biodiversity. If earth's history is to be a judge, life flourishes in the warmest periods, and we are not near the all time warmth record. Also the increased Carbon dioxide will increase life's abundance as tree lines stretch to higher elevations and plants grow more vigorously in general.
For every arctic animal threatened by global warming there must be many more warm weather species that benefit.
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