FYI (write this down)... data collected by scientists dates back thousands of years especially thru ice cores. It is very easy to measure VERY accurately the amount of co2 in the atmosphere by analysing the fossil ice and the data gets interesting over the last 200 years due to industrialisation with an anomoly from krakatoa eruption. There is a sharp constant spike in co2 levels since the turn of the last century. Humans have not onlybaktered the landcover and seas but also the atmosphere. And climate of course!
