In general terms, population growth and our consumption are the reasons for this enormous loss. Specifically, habitat destruction and wildlife trade are the major causes of population decline in species.
building materials and
And this over-exploitation (hunting, fishing, bycatch) is currently totally unsustainable.
Adding to the pressure is Climate Change - the full effects and impacts on Biodiversity and how life may (or may not) adapt is still very much an unknown quantity.
Mediterranean bluefin tuna — highly prized around the world, especially in Japan for sushi and sashimi — has been under increasing pressure from overfishing. Display of frozen tunas to be auctioned at the Tsukiji fish market, Tokyo, Japan.