It's not just about the carbon that's released, though. Conifer trees are darker and absorb more solar radiation. When less of that radiation is reflected into space, the planet can heat up.
Some countries are already planting trees to help combat climate change. China, for instance, has been planting a "green wall" in the Gobi Desert, a project that would eventually include over a million square miles of trees.
And in 2014, the U.N. established the New York Declaration on Forests to restore deforested land.
But the study warns that those types of plans risk failure if countries don't consider the type of trees used or the forestry management techniques used to maintain them.