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Transcript of Biodiversity
WHAT IS BIODIVERSITY?
Biological diversity - or biodiversity - is a term we use to describe the variety of life on Earth. It refers to the wide variety of ecosystems and living organisms: animals, plants, their habitats and their genes.
Biodiversity is crucial for the functioning of ecosystems which provide us with products and services without which we could not live.
MAIN THREATS TO BIODIVERSITY
An ecosystem: a community of plants, animals and smaller organisms that live, feed, reproduce and interact in the same area or environment.
An ecosystem service: a service people obtain from the environment.
-Species' extinctions are continuing at up to 1,000 times or more the natural rate.
-Since 2000, 6 million hectares of primary forest have been lost each year.
-1,910 of the planet's 6,312 amphibians are in danger of extinction, making them the most threatened group of species known to date.
LOSS OF BIODIVERSITY
-19,265 species out of the 59,507 so far assessed are threatened with extinction.
WHY WE NEED BIODIVERSITY
-PROTECTION FROM STORMS AND FLOODS
-EXTINCTION OF INDIVIDUAL SPECIES
-HABITAT LOSS AND DEGRADATION
-INVASIVE ALIEN SPECIES
-OVER-EXPLOTATION OF NATURAL RESOURCES
-HUMAN-INDUCED CLIMATE CHANGE
According to the Millenium Ecosystem Assessment, the total number of species on Earth ranges from 5 to 30 million and only 1.7–2 million species have been formally identified.