In the Arctic, trees and forests just do not happen. However, long ago they did when the area was warmer and then turned cooler. As it turns out there are many such northern forests that have been preserved by mineralization and similar processes. The northernmost mummified forest ever found in Canada is revealing how plants struggled to endure a long-ago global cooling. Researchers believe the trees — buried by a landslide and exquisitely preserved 2 to 8 million years ago — will help them predict how today’s Arctic will respond to global warming.