SYDNEY , Australia (AFP) — Large parts of Australia’s Great Barrier Reef could be dead within 20 years as climate change drives mass coral bleaching, scientists warned Friday. The World Heritage-listed reef is currently suffering its worst bleaching in recorded history with 93 percent of corals affected due to warming sea temperatures. Experts from the government-backed ARC Centre of Excellence for Climate System Science said in a study that if greenhouse gases keep rising, similar […]