I just did a quick readthrough of the wikipedia entry for "Effects of Global Warming" and it doesn't really scare me.
There's a lot of talk about the potential effects on things like rising sea levels (0.8m over the next century doesn't sound like enough to me to make that much of an impact - especially for me since I live so far inland), species extinction (some species will flourish, while others may disappear - I like penguins, but their extinction won't really change how I live my life), agriculture (again some areas of the world will benefit from the increased precipitation, while others will become more desert-like), and weather (I don't mind big storms).
Maybe it would have more of an impact if it explicitly stated how human lives will be affected. It doesn't mean much to say the ice caps are melting and sea levels will rise, if there's no consequences given. But I didn't read anything that sounded so severe that we wouldn't be able to adapt to quite easily.
I just think most people don't care because they don't know how it will impact them personally (if it will at all). There's nothing I read that makes me think my life will change at all. The article does state that developing nations will feel more of the effects than developed nations.
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