Satelite data show significant average global temperature rise in the last decades. For the previous periods, we have only proxy data with great uncertainties. Hundreds of nonlinearly interacting parameters control climate. To base our strategy on only one parameter - CO2 - is very short sighted. There are other greenhouse gases. Other main variables are solar radiation changes, World Ocean impact, winds, volcanic activity, etc., which are independent from man’s influence. Renewable resources are viewed as method to reduce CO2 emission. Calculations show that we can cover only 10 – 20% of our current energy needs using renewable resources. We do not understand climate change mechanisms, and we do not have reliable techniques to reduce CO2 emission and we do not have energy sources to cover our increasing needs