If you have some credible evidence that human sources of CO2 have caused, are causing, or will cause significant warming, then trot it out. I've been waiting fo

If you have some credible evidence that human sources of CO2 have caused, are causing, or will cause significant warming, then trot it out. I've been waiting for such evidence for years. By now you have a big problem: We have had in recent years a significant increase in CO2 but without a significant increase in temperature. So, we have good evidence that the warming effect of CO2 is tiny, too small to detect.