WITH AFP STORY: US-environment-biology by Juan Castro OliveraThis undated University of Miami handout image shows a diver writing down observations of marine species in the Dry Tortugas National Park in Florida.Global warming and pollution are decimating coral reefs around the world, with only 25 percent in good health in the Caribbean Sea, US experts warned July 8, 2008. In other areas of the world such as the Pacific basin, nearly 70 percent of the coral reefs are either thriving or in good condition, the National Oceanic and Atmospheric Administration (NOAA) said in a report.AFP PHOTO/HO/University of Miami/ = = RESTRICTED TO EDITORIAL USE = = GETTY OUT = =