I also found very interesting articles that suggest that the first plants on planet earth could have started ice ages. I wrote it down here just to be sure.

One of the lead researchers, Professor Tim Lenton of Geography at the University of Exeter said: "This study demonstrates the powerful effects that plants have on our climate. Although plants are still cooling the Earth's climate by reducing atmospheric carbon levels, they cannot keep up with the speed of today's human-induced climate change. In fact, it would take millions of years for plants to remove current carbon emissions from the atmosphere."

Source: https://www.sciencedaily.com/releases/2012/02/120201094923.htm