Please bear in mind that humanities current understanding of the earth is quite limited. When seen from space on the night side our lighted cities make it seem like we are a major part of the world. In reality we do not compose a very large part of the biomass of the world. Our carbon footprint is dwarfed by other natural events such as volcanic eruptions and oceanic currents. Carbon dioxide levels, while higher, have only a small effect compared to water vapor. CO2 levels mostly effect cold dry regions. In other areas H2O vapor levels swamp out CO2 levels in effects on heat retention. No one, especially experts in one or more fields, like to say they do not know. At the current time no known theory has shown to be accurately predictive of climate change. Because of this lack of experimental confirmation the current climate science community is still in the "developing hypothesis" stage of science. Politics has come into play which has further muddied the waters. Science requires the free flow of information and the testing of hypothesis. The current trend of blocking alternate hypothesis is not in line with the scientific method. Climate science might be able to predict the climate someday. At its current level of development the farmers almanac is more accurate in predicting climate.