Don't belive everything you see on TV. I am a journalist, so I ought to know :P
Having done a news story about the "record breaking summer" here in austria in 2003, I heard some interesting things from a meteorologist:
Firstly, we collect scinetific climate data for about 150 years. So basically, we started measuring the climate in a phase of warming. Thus, the timeframe we use to judge our climate by is insignificant, therefore not allowing us to see a "norm" temperature. Scientific evidence suggests that we are still in an exceptionally cold age.
Secondly, allthough the global warming is well recorded and can be regarded as a fact, human induced global warming is a hypothesis that is not proven true. In fact, a multitude of scientists, including the professor I interviewed, regard this hypothesis sceptically and oppose it. Due to the very biased media coverage though, these scientists have hardly any plattform to pblish their views publically. As it is, the "we cause global warming"-theory has become such a dogmatic belief that people who oppose it openly are instantly regarded as "evil".
And concerning the quite esoterical view on "balance of the nature". Nature is not in balance. If it was, it would be stagnating. Nature is about imbalance and trying to counter it, otherwise there wouldn't be any progress or evolution.
Now even if the extinction of a species would have huge effects, it wouldn't mean the end of life as we know it. Of course it would unsettle the "balance", but only temporarily. After all, our nature is a wonderful self regulatory system, and, as I often admire: life always finds a way to go on.
On a sidenote: I vote green by heart. I oppose any kind of pollution and I definately want our nature to be preserved. Or rather "not be negatively influenced", as preservation too is a huge manipulation in the cycles of nature.
But the debate of global warming has reached an almost religious level. Just look at this thread. Anyone to oppose the very idea which is far from scientific fact, that we cause the warming is yelled at.