Biomes, Ecological Cycles, and Environmental Milestones

What is the rate of species extinction in the tropical rain forests?

Biologists estimate that tropical rain forests contain approximately one-half of Earth’s animal and plant species. These forests contain 155,000 of the 250,000 known plant species and innumerable insect and animal species. Nearly 100 species become extinct each day. This is equivalent to four species per hour. At the current rates, five to ten percent of the tropical rain forest species will become extinct every decade.


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