A study was published this week that indicated man is responsible for
reducing global tree populations by around 50%, and in doing so, having
a huge negative impact on global climates.
Not all trees are the same, and not all forests are the same. Some are bigger, others denser. Some grow slower, some live longer. Some are deciduous and don't mitigate carbon dioxide emissions so much when the leaves drop.
If we are to seriously reverse the affects of deforestation; we need to understand the science, have a very good understanding of a large range of different tree species, and apply a high level of horticultural skill to establishing large numbers of the best tree species in the most appropriate locations.