What positive and negative long term and short term effects of climate change?

Global warming endangers animals and plants all over the world. The biggest risk comes from habitat change. For example, polar bears rely on cold, snowy regions. As the planet warms and these regions shrink, polar bears will no longer have a place to live. The long-term impact is not only on large animals, but also on smaller animals such as insects, frogs and fish. Extinction affects the food chain and puts stress on the surviving animals to find adequate food. The extinction of animals and plants eventually affects human choices for food as well.

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Well, an example is like the Ice Age.
When the climate change drastically dropped, it caused almost the whole entire planet to freeze, and surviving on Earth became extremely difficult.
When the climate change drastically increased, all the ice from the Ice Age began to melt and huge portions of land was wiped out by the melted water, which is why many of our countries today are actually smaller than they were supposed to be since the water took over and became part of today's ocean. 
I hoped I helped you! ^u^