This is a chart showing the level of CO2 in the atmosphere over the last 800,000 years which spans all the time since humans have evolved. It is actually a short video which you can watch here. The rate of rise in CO2 is showing no sign of slowing. Permafrost is melting which will add more and more methane, a potent greenhouse gas, to the atmosphere. Arctic ice cover is shrinking year on year. Greenland and Antarctic ice is steadily melting. Ocean acidity is rising. Weather patterns are changing and severe storms, bushfires and floods are more frequent. Corals are dying, sea grasses are dying, habitat ranges are changing and biologists are stating we are in the midst of a huge extinction event.
It is not a pretty picture. How best to respond?