Answer: B. threatens polar ecosystems.
Global warming threatens a variety of ecosystems. In fact, it is unlikely that any area of the world will be unaffected by this phenomenon. However, one of the most vulnerable areas of the world is the polar ecosystem. The Poles are very sensitive to climate changes, and they have been affected for many years now. The rise in temperatures has led to the melting of the ice caps. This not only affects animals that live in these regions, but it contributes to the rising of sea levels all over the world.
