The whole global warming stuff gives companies the opportunity to make an "eco freindly" (and twice as expensive) product, and people like GreenPeace a reason to whine. Whether it's true or not...
"Whether it's true or not..."
I think that global-warming is pretty much indisputable, especially when you look at how much melting is occurring in places like the Arctic Circle and the various, large ice shelves in Antarctica.
Personally, I blame an increase in volcanic activity and increased solar activity moreso than anything humans can do and was glad when Bush refused to sign Kyoto.
There's plenty of evidence of warming, but little that can accurately pinpoint it on 'Man', especially when you consider the extremely large volumes of greenhouse gases released by a volcanic eruption.
Also, when 'human reasons' are given, they usually try to blame 1st world activity, namely the USA, rather than the more-probably slash&burn deforestation techniques used to decimate the South American rain forests and African jungles. After all, trees do remove CO2. Shouldn't the large-scale reduction of trees be a primary cause, rather than me driving my Honda to work?
It's quack science. Man would like to think his significance is great enough to affect the climate of the universe, but it ain't.