the world's largest coral reef systems, according to two Australian researchers. A spokesman for the federal environment minister, Sussan Ley, said the report reflected the extreme weather events Australia had experience over the past 12 months. The high rainfall in the summer is due to the unpredictable tropical cyclones that hit The Great Barrier Reef. As climate activists urge the world leaders to shift from fossil fuel to renewables and listen to the scientists, a recent research has presented another grim report regarding nature’s creation, the Great Barrier Reef. RELATED: Climate change has killed half of the Great Barrier Reef's corals, study finds Climate VIDEOGRAPHIC During one of the earlier bleaching events in 2005, snorkelers enter the waters of the Great Barrier ... [+] Reef, as scientists experimented with shade cloths to stop bleaching which was already affecting huge swathes of the tropical Queensland coral reef unfurling for over 2,300 kilometres (1430 miles). The Great Barrier Reef, or GBR in Australia, a UNESCO World Heritage site, now has an IUCN status of “critical” because of climate change. Aerial view of the Great Barrier Reef, its coral banks, and reef systems skirting the Pacific ocean. which is made up of scientists, renewable energy and policy experts. “Human-caused climate change” is causing an “utter tragedy” to one of the world's largest coral reef systems, according to two Australian researchers. After climate change, the next two significant threats to these natural sites are invasive alien species and tourism impacts. The yearly average rainfall varies depending upon the location of the coral reef. The Great Barrier Reef is the world's largest coral reef system composed of over 2,900 individual reefs and 900 islands stretching for over 2,300 kilometres (1,400 mi) over an area of approximately 344,400 square kilometres (133,000 sq mi). Working for print, digital and radio outlets on four continents, I am also a veteran hotel industry reporter and author of travel guides and cultural histories to Australia, France, Italy, Spain, Switzerland and Borneo. Working for print, digital and radio outlets on four continents. First, El Niño brought warmer water to the Coral Sea i ... [+] One magazine describes the marine phenomenon as “larger than the Great Wall of China and the only living thing on earth visible from space.”. This included poor … Climate change biggest threat to natural World Heritage sites, among them Australia's Great Barrier reef. This is the most spectacular and biggest coral reef system globally, which used to have a health status of “significant concern.” This status is based on the classification system set by the IUCN or the International Union for Conservation of Nature. The Great Barrier Reef is under threat by hot waters that have everything to do with our failure to take climate action. Half of the Great Barrier Reef has been bleached to death since 2016. I have three decades of experience as a journalist, foreign correspondent and travel writer-photographer. Last year the government’s Great Barrier Reef Marine Park Authority, charged with protecting the fragile ecosystem, downgraded its long-term outlook for the reef’s survival to "very poor." It finds the conservation outlook for the Great Barrier Reef has worsened from “significant concern” to “critical” – the most urgent status under the IUCN system. “As summers grow hotter and hotter, we no longer need an El Niño event to trigger mass bleaching at the scale of the Great Barrier Reef,” Professor Hughes says. Coral bleachingoccurs when corals become heat-stressed enough to expel their primary source of food, the microalgae that live inside their cells. The renowned coral reef scientist, Terry Hughes, said it was logical the IUCN had moved the Great Barrier Reef into the critical category after three bleaching events in five years. “The scale of bleaching is enormous during global bleaching events,” according to Professor Hughes, “the situation brings me to despair.” The first recorded mass bleaching along the Reef struck in 1998, at the time the hottest year on record. Unlike the typical four seasons experienced by most of the country, the Great Barrier Reef is divided by only two seasons however the two are quite distinct. UN climate summit president thanks Australian states – but not Morrison government – for backing net zero, Study finds only 300 swift parrots could remain as Tasmanian court challenge heard. The current bout of coral bleaching on the Reef, “the third in just five years”, is the “most severe and the most widespread” ever. 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