News Earth Global warming may already be a killer By Christen Brownlee February 14, 2006 at 1:41 pm - More than 2 years ago Share this:Share Share via email (Opens in new window) Email Click to share on Facebook (Opens in new window) Facebook Click to share on Reddit (Opens in new window) Reddit Click to share on X (Opens in new window) X Click to print (Opens in new window) Print Earth’s rising temperatures may be a precipitating factor in the extinctions of dozens of tropical frog species, according to new research. CROAKING? This harlequin frog belongs to a group of species that is rapidly going extinct in Central and South America. F. Brem At least 110 species of harlequin frogs once lived in Central and South America, but two-thirds of them went extinct in the past 2 decades.