The study shows that the space available for trees is far greater than previously thought, and would reduce CO2 in the atmosphere by 25%.
The authors say that this is the most effective climate change solution available to the world right now.
The ability of trees to soak up carbon dioxide has long made them a valuable weapon in the fight against rising temperatures.
The Intergovernmental Panel on Climate Change (IPCC) said that if the world wanted to limit the rise to 1.5C by 2050, an extra 1bn hectares (2.4bn acres) of trees would be needed.
The problem has been that accurate estimates of just how many trees the world can support have been hard to come by.
This new report aims to show not just how many trees can be grown, but where they could be planted and how much of an impact they would have on carbon emissions.
For more information on how Green Motion's Green Heart carbon offset initiative is contributing to reforestation in Costa Rica visit greenmotion.com/green-heart-donation