Sorry for getting a little carried away with my opinion... :whistle: Yea, I'm not a scientist but I am a concerned citizen that doesn't like the direction his country is headed...
Nothing wrong with caring about your country. I think that most people on here care about their country, no matter their political view.
Assuming the data is being collected correctly and that we have enough of it...
Always a good question. 1 or two tests is not enough, obviously, but if many repeated tests come back showing the same result, it soon becomes obvious which way the data is heading (supporting or disproving the hypothesis).
Even if the globe is slowly warming and cooling in cycles, we don't fully know if that's because of us or just a natural cycle of the planet or related to the cycles of the sun's solar flares.
Certainly the globe has undergone massive overheating and supercooling in the past (look into snowball earth and the Carboniferous period for examples of each). Is the current warming trend human caused? Well it seems like the correlation between global CO2 and global temperature is pretty strong. Yes, obviously, CO2 is not the strongest "greenhouse gas", but it IS the most abundant, and quantity has a quality all its own. Methane may be 10x stronger than CO2, but CO2 composes about 0.0383% of the earth' atmosphere, whereas methane is only 0.0001745% (quick grabs from Wiki, so maybe not 100% accurate, but pretty close to what NASA lists as well).
I've recently read that the solar flares are in a lull right now and will build back up around 2012 and in correlation our global temperatures have slightly dipped since the early 2000s. Sorry, I couldn't find a decent link in a timely manner or the time to fully research it...
If you do, I'd be interested in reading more. Solar flares are interesting things in their own right, I'd never heard about a correlation between flares and temperature.
And even if our release of CO2 is slightly warming the planet, which I highly doubt, that doesn't mean that we shoot ourselves in the foot and regress as a civilization while China dumps loads of pollutants and overtakes us both militarily and economically. :roll:
That's politics, not science.
A scientific question that has political implications, however, is "Can humans do anything about the increase in global temperatures?"