previous studies indicate about half of global warming is caused by carbon dioxide gas from fossil fuel burning , about 20 per-cent is due to chemicals called chlorofluorocarbons, or CFCs, and an additional 20 per-cent iscaused by methane, which is natural gas. Other trace gases cause the remaining warning
fossil fuel burnig heat's atmosphere
chlorofluorocarbons are dangerous chemicals
methane, natural gas increases future temperature
carbon dioxide, CFCs and methane cause global warming