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. 

Over 40% of Belarus' 207,600 square kilometres (80,200 sq mi) is forested. About a fifth of Belarusian land (principally farmland and forests in the southeastern regions) was affected by radiation fallout from Ukraine's 1986 Chernobyl nuclear disaster.

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.