There's some research that has been done into the Little Ice Age being caused by the reforestation of the Americas after disease wiped out the populations: http

There's some research that has been done into the Little Ice Age being caused by the reforestation of the Americas after disease wiped out the populations: https://phys.org/news/2011-10-team-european-ice-age-due.html https://phys.org/news/2011-10-team-european-ice-age-due.html.