Mixing trees and farm crops can be beneficial for farmers and climate

 A Science News article that features a farmer in Kenya explains how planting rows of trees in between rows of normal crops helps the crops because it helps the soil retain moisture and nutrients (due to the trees' vast root systems), so the normal crops can grow even during the dry season or droughts. And if one plants fruit trees, it adds to the food yield of the farmland while keeping the soil healthier. 

Of course, trees are the main natural carbon sink of our planet, and more trees can only help in our fight against climate change. This photo presents the concept in France.