The report’s lead author, Albert van Dijk of the Australian National University’s Fenner School of Environment and Society, told The Guardian that 2019 was “probably the worst in a century or more” for the environment in Australia.
“This is not the new normal—this is just getting worse and worse,” he said, adding that 2019 had seen a “continuing descent into an ever more dismal future. You start to see ecosystems fall apart and then struggle to recover before the next major disturbance.”
The report scored environmental conditions across seven indicators–inundation, streamflow, vegetation growth, leaf area, soil protection, tree cover, and the number of hot days. Across all years analyzed, 2005 was the next worst year, impacted by the millennium drought. The year 2010 was the best; it was also one of Australia’s wettest on record.
Van Dijk said the cause of the impacts for 2019 were global heating as well as natural variability in Australia’s climate. The number of days above 35 degrees Celsius was 36 percent higher than in the previous 19 years.
The country's population continued to grow, and greenhouse gas emissions remained high, the report said. Greenhouse gas emissions per person were 11 percent below the 2000-18 average, but they remained among the highest in the world because of high energy use per person and the burning of coal for electricity.
The findings were underpinned by about 1 million gigabytes of data, including satellite data that only became available from 2000, as well as field data and on-the-ground surveys.
Reviewing biodiversity impacts, the report said the number of spectacled flying foxes–one of many species vulnerable to heat stress–had dropped to 47,000 from an average of 100,000 before 2016. The numbers of threatened species has risen by 36 percent since 2000, the report said.River flows were 43 percent below the 2000-18 average, causing water storages to drop and mass fish deaths in the Murray-Darling Basin, and wetland environments also saw record-low inundation. River flows were above average around the coast of northern Queensland, around Karratha in Western Australia, and at Strahan in Tasmania’s west.
The protection of soils by vegetation and moisture was “extremely poor,” causing dust storms. The average soil moisture was also the lowest since at least 2000, and farming productivity had been hit.The Great Barrier Reef, which just experienced its third mass bleaching event in five years, escaped bleaching in 2019 but its condition remains poor.World Heritage-listed Gondwana rain forests, the Blue Mountains, alpine regions, eastern Gippsland, and Kangaroo Island were all badly hit by bushfires.A coauthor of the report, Marta Yebra, said: “Our data clearly shows that the combination of dry forests and hot weather made for an especially explosive mixture.”
NIWA's Hotspot Watch for 29 March 2019
All the findings and data from the report, now in its fifth year, can be viewed on a website and interactive map.
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