Solar panels do work on cloudy days, just not as well. Also you can say CO2 is good for plants, as that is correct, but to use that fact to try to show how global warming is not bad just shows you don't understand this at all. The amount of CO2 which benefits plants depends on the species. The most important plant species for humans are our crops. These have been engineered over the course of human existence to yield the optimum nutritional value for our current CO2 levels - adding more CO2 will increase crop yield by weight, but decrease the crop's nutritional value. The extra CO2 also brings with it increased temperatures, bringing different pests to the crops, and slowly moving arable farmland towards the poles (and it crosses borders like they weren't there), where infrastructure, experience, and communities might not exist to make use of it. This is just scratching the surface of the complicated relationship between plants and CO2, something you are either entirely unaware of or dishonest enough to ignore.