Opponents of global warming's greatest weapon is doubt. If they can place a single ounce of doubt into the public's mind about whether or not global warming exists, then they will forever be able to argue against it irregardless of facts.
It is just like what the tobacco companies did. They placed doubt about whether or not smoking was harmful in the public's mind. They had doctors come out and say that it was healthy. Regardless of how much the medical science community would say it is harmful, if the public heard even the slightest bit of controversy as to whether or not it is true, they'll hold off judgement.
The scientific community is huge. Among the scientific community, there is extremely little doubt as to the idea that global warming exists. There will always be coverups, scams, and forged studies on both sides. But, you have to look at the overwhelming majority of scientists that have come to the conclusion that not only is global warming an grave danger, but that humans are a big cause of it.
Both sides will obviously lay out either misinformation or exaggeration for their cause. But at the end of the day you have to look at the cold hard facts and realize that you can't ignore the fact that humans are causing changes to the atmosphere in drastic ways and that just maybe it might not be in a good way. Never in the last 400,000 years has the CO2 levels been about 300ppm and since the turn of the century it has been rising steadily way above that mark. There is all kinds of overwhelming evidence just like that if you seek it out for yourself from independent sources. Combine that with the all the evidence of events around the world and you can piece it together yourself.
Someone on here just said that the southern ice cap is growing. That just shows you the kind of miss information that is spewed out by skeptics. Sure, the southern ice cap IS growing while the northern one is shrinking. But that happens every year! That is because the south has their winters while the north has their summers. The southern ice cap grows when the northern one shrinks. But, you have to look at how much it grows versus how much it shrinks every year. Each polar ice cap has been shrinking MUCH more than it has been growing every year. This is resulting in the reduced ice cover we are seeing each year. If you looked at the satellite photos of the ice caps, you'd see it yourself. There are numerous ice shelfs in the Antarctic that have completely collapsed because of the warming.
Even one of the biggest opponents of global warming Senator Inhofe who claimed that global warming was the "biggest hoax" ever put on the American people has retracted his statements that it doesn't exist and now says it does exist, but that man is not the cause. I wonder how long it will be before he changes that view point...seeing as how he receives a lot of money from the oil industry, it probably won't be any time soon.
The time for ignoring it is over and people just need to wake up. Unfortunately it usually takes things getting worse before people say "you know, maybe this is a problem". Wouldn't you rather error on the side of good and look back in hindsight saying that your intentions were good versus looking back in hindsight and say to yourself "why didn't we do anything?"