I was once a serious environmentalist and voluteered my time to file suits and argue in Federal court on behalf of clean water clean ocean groups.
I am completely serious... with this statement.
There is absolutely zero science showing man made co2 is warming the earth right now.
granted... co2 may warm the earth with the greenhouse effect...
but it also cools the earth by blocking the suns energy too.
1.
studies have shown as you add more co2 each additional bit is logarithmically less effective at warming however... it may make the earth increasing opaque to the warming.
see the NASA study I have cited here dozens of times showing co2 cools.
2. we are not even sure the earth is warming outside of natural variability. this is a big point. recent studies show it was warmer in the recent past.
3. recent studies have shown that the sun and the tides and currents are very important in driving temps.
4. (this was a repeat)
5. as can be seen by my charts just above CO@ matches up with and lags change in ocean temps.
therefore there is a very good chance co2 accumulation and dissipation responds to heating and cooling the way water vapor does. Warm air hold more.
6. if you study the charts I showed you above you would see that man made co2 does not track with the change in overall co2 accumulation each year.
So in short adding man made co2 may warm.. it may cool... it may do nothing in our current environment.
I am waiting for the science.
If you think you have some showing man made co2 causes warming... please produce it.
http://www.skepticalscience.com/empirical-evidence-for-co2-enhanced-greenhouse-effect.htm