Lets say your an environmentalist. You see people, companies and governments all ignoring the planet. For years the movement you hold so dear had gained little momentum. Some in your movement are now breaking laws and endangering people for the greater good.
So in order to make your point you gather a bunch of data and make a graph, only to find out it does not illustrate your belief that man is throwing so much bad stuff into the air it is causing the planet to warm at an alarming rate. So you go back and massage the numbers until you get the desired graph. This is what Michael E. Mann, Raymond S. Bradley and Malcolm K. Hughes did and it is referred to as the the MBH98 reconstruction or the Hockey stick graph and it largely started the Global warming myth, which was renamed Man Made Global warming then Climate change.
It is the classic road to hell paved with good intentions. The Media picked up the ball and ran with it, regurgitating bad data without looking it up.
When politicians got ahold of this it stopped being important to have the facts, it became "the Big Lie" and a way to get funding for various things, it also got people elected and re-elected.
I actually do not have much disagreement with recycling, eating lower on the food chain, lowering electrical usage etc. I more rail against the censoring of real scientific debate over a subject that has become more important then feeding people. Anytime someone tells you "The Debate is over" they are selling something...
Some buried news items:
Nasa's Goddard Institute for Space Studies falsly announces October hottest ever
Panel on Climate Change scientist dismayed at Global Warming spending .vs. the poor.
scientific data on what is causing global warming is "contradictory"
The Oceans have stopped warming!
Global Warming Hits Mars!
Sun to blame for Global Warming
Finally a really nice Wiki entry.
Global Warming Swindle