A recent study involving 48 farms in two states shows that an abundance of wild bees means a lot of pollination. A Rutgers University study published in Science concludes that over a larger area, a variety of bee species is necessary in pollination. This study is the first of its kind to show that increased pollination occurs in nature from a having bee species diversity. In this way, biodiversity is as important to humans as clean water and air.
Read about the study here: https://www.sciencedaily.com/releases/2018/02/180215141707.htm