More than 330 communities and 864000 people are directly and indirectly supported economically by canada"s forests. Forest products are the biggest net contributor to canada"s visible trade balance, to a considerable degree defining canada"s global economic role. About 40% of the earth"s land surface supports trees or shrub cover: forests occupy about 4 billion hectares of the world"s land area. Forests may be classified as temperate, boreal, or tropical. Tropical forests provide habitat for over one-half of the earth"s plant and animal species, and the homes and livelihoods for about 100 million people. Forests cover approximately 46% of canada"s lade base: the boreal forest covers 1/3 of canada, constituting canada"s largest biome. Unlike most nations, the vast majority of canada"s forests are publically owned. Forest products continue to be one of the largest contributors to. Canada"s balance of trade: canada"s forest products exports were valued at approximately billion.