The United States ecology is megadiverse: about 17,000 species of vascular plants occur in the contiguous United States and Alaska, and over 1,800 species of flowering plants are found in Hawaii, few of which occur on the mainland. 

One of the smallest countries in Africa, Burundi's lands are mostly agricultural or pasture. Settlement by rural populations has led to deforestation, soil erosion and habitat loss. The government of Burundi pledged to restore 2 million hectares of land by 2020.

There are currently 78 protected areas in Nicaragua, covering about 17% of its landmass. Nicaragua has committed to restoring 2.7 million hectares of its land by 2020, through a pledge to the Bonn Challenge.