I agree with you that some of the proposed measures to reduce the CO2 emissions are ridiculous. I think the greenhouse effect is real but global warming cannot be explained by the current CO2 emissions. The problem is that we have no good explanation for the current sudden increase in temperature. You show that similar increases in temperature have occurred in the past 500000 years but you don't explain why. They could have been caused by meteorites, huge volcanic eruptions or increased solar activity. We don't experience that at the moment so most likely it is caused by human activities.