Mongabay: Today is International Forest Day, which was launched by the United Nations March 21, 2012 to promote the importance of forests and trees. In recognition of the designation, below are ten facts about forests. Forests cover around 4 billion hectares or 30 percent of Earths land surface Forests cover about four billion four billion hectares (16 million square miles). That represents about 30 percent of Earths land surface or eight percent of its total surface area. Ten countries hold about two-thirds...