Final answer:
The biome that covers the highest percentage of forest area in the world is the tropical rainforests, known for their vast biodiversity and critical ecological role despite covering a small geographic area.
Step-by-step explanation:
The biome that covers the highest percentage of forest area in the world is the tropical rainforest. These forests, also known as tropical wet forests, are highly noted for their remarkable biodiversity, which contributes to them being referred to as nature's pharmacy. Tropical rainforests have historically covered approximately 16 million km²; however, deforestation for logging and agriculture has reduced this area significantly. Today, less than 9 million km² of the original tropical rainforest remains. Despite their relatively small geographic coverage, they play a crucial role in receiving nearly half of the world's rainfall and maintaining ecological balance.
Other forest biomes such as temperate coniferous forests, temperate deciduous forests, and tropical monsoon forests also encompass significant areas, but not as extensive as tropical rainforests. The diversity and function of tropical rainforests are of monumental importance, thus, they are given significant attention in conservation efforts.