Man changes the nature at such a rate that the species may no longer reach adjust, with the key to a major extinction crisis, say scientists. Some numbers:
- One in four mammals, one bird out of eight, one in three amphibians and nearly half of freshwater turtles are threatened, according to the World Conservation Union's (IUCN) Red List.
- At least 15.589 species face a risk of extinction, according to the Red List 2004 or 7.266 8.323 animal species and species of plants and lichens.
- The rate of species extinction is to 100 1.000 times greater than the natural rate (ie the rate measured in geological time due to normal renewal of ecosystems).
- In total, 1500, 784 animal and plant species are considered extinct, and additional 60 survive in captivity or in cultivation.
- Alongside iconic species such as the dodo (a kind of large flightless pigeon), disappeared after the arrival of the first settlers in the Indian Ocean islands to 1740, the largest penguin in the northern hemisphere, Galapagos turtle elephant or the Tasmanian wolf, thousands of unknown species disappear every year.
- The man was described as 1,75 million species on an estimated total of 10 and 30 million.
- For each tropical plant that disappears, it is estimated that about 30 associated species disappear. For each tropical tree, it is 400 disappearing species.
- An average global warming could lead to the disappearance of 15 37% of the species, according to modeling conducted on a thousand plants and animals in 6 particularly biodiverse regions of the world (Thomas, Nature January 8 2004).
- Three quarters of the world population will heal with plants and 70% of our medicines are derived from plants (Nicole Moreau, CNRS)
- The taxonomists discover every year more than 10.000 new species, mostly insects, beetles and foremost representing almost a quarter of the described species.
sources: International mail