In the diagram below, the lower blue oval represents the past 1.2 million years with the Earth cycling between ice ages. The red dashed line shows the planet heating up. Humans with either control the heating and enter the Verdant Age, or the heating will continue into the Hothouse which will kill-off most life on Earth. We need to transform our world if we are to enter the Verdant Age. The diagram is based in the science paper below.