Because that's not what many scientists are saying.
Yep, the number of those who disagree does appear to be rising (though even that is hard to know), but since most of us are not climatologists (including professor Plimer), it seems to this observer that listening for more learned opinions is worth doing.
And I absolutely agree with Chock that being "good stewards of the earth" is a worthwhile goal, regardless.
I regret my use of the term "clueless" earlier in this thread woxof, it clearly bothered you and for that, I apologize. It's interesting though, that even since then you've continued to post tidbits that make it appear, to me, that you may still not be aware of the difference between local weather and climate.
I think if you'd read a little from some better sources, you'd find that even those scientists who continue to endorse the global warming theory will tell you the temperature changes they anticipate would be on the global average... which doesn't mean that everywhere would experience warmer temps. What it would mean is greater changes in weather would be more common... more extremes... some areas could even experience lower temps.
That's how I understand it.