Environmental News Network: Once there were vast forests covering North America and Europe. What happens to the climate if they were returned? Planting trees in an area where there are no trees now, can reduce the effect of climate change by cooling temperate regions finds a study in BioMed Central's open access journal Carbon Balance and Management. Afforestation could lead to cooler and wetter summers by the end of this century if it was done now. Of course doing it now is a problem not only of resources of what it replaces...