The causes of biodiversity loss

What are the main causes of biodiversity loss in the world?

The clearing, fragmentation and direct destruction of habitats. It is the number one cause in the World.
Resource harvesting and over-exploitation of species (e.g. over-fishing).
The introduction of invasive alien species. It is the first cause of biodiversity loss in tropical island environments.
Pollution of water, soil and air.
Climate change.
The combination of these different causes is generally an aggravating factor.

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