Then, within 150 years, it got so cold everyone had to leave. If that is indicative of a trend that could occur in the rest of the Europe, it won't be long before border guards are accepting buckets of diamonds for fake visas as Europeans try to bluff their way into places like Bangladesh. The next glaciation will kill far more than any C0-enhanced temperature rises, especially as any such rises will cause more evaporation and more rain. In this two-up game, I'll go for heads. While some measurements do suggest that temperatures on the Earth are rising, and the increase may be partly due to additional greenhouse gases, that could as easily be a natural rise in temperature before the next southerly buster.
Heat is good.
Cold is bad. It's worth remembering that greenhouse gases have existed in the atmosphere for all of Earth's history. Your hands would be shaking so much you couldn't even read this. None of which is to suggest that we should do any more harm to the environment. Pollution, deforestation, soil erosion, and marinas in the midst of national treasures are all bad.