Today, evolution no longer suffices to fill the gap left by species lost because of human factors. The speed at which species are being lost today is cutting off the source from which new species would have sprung.
到了今天，大自然已無法依靠演化來彌補人為因素喪失的物種，現有物種壓縮在短期間消失，也等於斷送新物種的出現。