Ok, so now the science isn't settled?

Western forests respond to climate change | CEJournal

It turns out that as the growing season in the Colorado Rockies has grown longer as a result of climate change, growth of trees in the forests has actually slowed down.

Study: Warmer temperatures make high-elevation trees grow faster

A study of long-lived pine trees at high altitudes concludes that the trees are growing faster, and higher temperatures are the likely cause.