We have decades of records showing the level of the earth’s carbon dioxide going up. Each summer in the northern hemisphere, where there is the majority of land and plants, the grass and trees actually take in more of the CO2 and produce oxygen, and the world CO2 level goes down for a few months. But in the winter there is far less photosynthesis and the CO2 level goes go back up further. Measured atmospheric CO2, monitored on a Keeling graph, shows the CO2 rising ever further each year. Some global-warming deniers point out that more CO2 will increase plant life which in turn will bring down the CO2. Indeed, more CO2 has resulted in more plants and photosynthesis today. But recent research shows the CO2 continues to climb faster than additional plant photosynthesis.