The thing I find most annoying about the global warming issue is that there's entirely too much politics and too little science. For instance, ask people the question "What greenhouse gas has the most influence on Earth's temperature?" and the vast majority will say "Carbon Dioxide."
Only problem with that answer is that it's wrong.
Water vapor accounts for about 95% of the total greenhouse effect on earth. Only about 5% is due to carbon dioxide. And the interesting thing is that most of that 5% is totally natural. Mankind only creates about 5% of that 5% giving about 0.27% of the total greenhouse effect that is contributed by mankind. Yes, just a smidge over one fourth of one percent.
Do I believe that global warming is real? Yes, I do.
Do I believe that global warming is due to mankind? No, I do not.
Some minor little details that the global warming crowd ignore that they really need to address.
1. Viking farms underneath the glaciers in Greenland. Archeologists have found these farms. Interesting thing. The existence of those farms indicate that Earth was warmer in the past than it currently is. Else those farms wouldn't be covered by glaciers. And given when those farms were made, mankind wasn't generating appreciable levels of carbon dioxide. That little detail right there makes their "global warming is due to mankind" argument more than a bit suspect.
2. Scientists have found a definite correlation between carbon dioxide levels and global temperature by analyzing ice core samples, tree growth rings, etc. It is a proven fact that higher global temperatures are associated with higher levels of carbon dioxide. Sounds like something good for the global warming crowd doesn't it? However, there is one slight problem. The correlation is skewed over time. It turns out that carbon dioxide level changes lag global temperature changes by approximately 40 to 50 years. That's right folks, when the temperature changes, the CO2 changes about 4 decades later. If you have a cause and effect relationship between two variables, I would expect the variable that changes first to be considered the cause, and the variable that changes later to be the effect. And the data doesn't look good for the "global warming is caused by mankind" crowd.
Why would CO2 levels change after a temperature change? One theory is that the solubility of CO2 in water decreases with increasing temperature and increases with decreasing temperature. And we have a very large body of water on this planet. The oceans can be acting as a huge CO2 repository and when they get warming, they release some of that CO2 and when they get colder, they absorb some of that CO2. That would definitely explain the lag.
Right now in my opinion, the global warming caused by mankind crowd are using CO2 as a means of demonizing the west. After all, it is a proven fact that burning fossil fuel does generate CO2. So those people can point to the west and say "See? They're harming the environment." They can't demonize plain old water vapor, even though water vapor is the biggest contributor to the green house effect. Are we having a significant effect on Earth's temperature? I wouldn't think so since we're only having about one fourth of one percent of the total effect.