// Disable warning messages 4507 and 4034. #pragma warning( disable : 4507 34 ) // Issue warning 4385 only once. #pragma warning( once : 4385 ) // Report warning 4164 as an error. The compiler adds 4000 to any warning number that is between 0 and 999.
1 These experts calculate that between 0.01 and 0.1% of all species will become extinct each year.  If the low estimate of the number of species out there is true - i.e. that there are around 2 million different species on our planet** - then that means between 200 and 2,000 extinctions occur every year.
Harvard biologist E. O. Wilson estimates that 30,000 species per year (or three species per hour) are being driven to extinction. Compare this to the natural background rate of one extinction per million species per year, and you can see why scientists refer to it as a crisis unparalleled in human history.