A Decade Of Exceptional Global Heat

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Climate Crisis
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The year 2019 concludes a decade of exceptional global heat, retreating ice and record sea levels driven by greenhouse gases from human activities. Average temperatures for the five-year (2015-2019) and ten-year (2010-2019) periods are the highest on record. 2019 is on course to be the second or third warmest year on record, according to the World Meteorological Organization.

The WMO provisional Statement on the State of the Global Climate, says that the global average temperature in 2019 (January to October) was about 1.1 degrees Celsius above the pre-industrial period.

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Concentrations of carbon dioxide in the atmosphere hit a record level of 407.8 parts per million in 2018 and continued to rise in 2019. CO2 lasts in the atmosphere for centuries and the ocean for even longer, thus locking in climate change.

Sea level rise has accelerated since the start of satellite measurements in 1993 because of the melting of ice sheets in Greenland and Antarctica, according to the report.

The ocean, which acts as a buffer by absorbing heat and carbon dioxide, is paying a heavy price. Ocean heat is at record levels and there have been widespread marine heatwaves. Seawater is 26 percent more acidic than at the start of the industrial era. Vital marine ecosystems are being degraded.

The daily Arctic sea-ice extent minimum in September 2019 was the second-lowest in the satellite record and October has seen further record low extents. In Antarctica, 2019 saw record low ice extents in some months.

“If we do not take urgent climate action now, then we are heading for a temperature increase of more than 3°C by the end of the century, with ever more harmful impacts on human wellbeing,” said WMO Secretary-General Petteri Taalas. “We are nowhere near on track to meet the Paris Agreement target.”

“On a day-to-day basis, the impacts of climate change play out through extreme and “abnormal” weather. And, once again in 2019, weather and climate-related risks hit hard. Heatwaves and floods which used to be “once in a century” events are becoming more regular occurrences. Countries ranging from the Bahamas to Japan to Mozambique suffered the effect of devastating tropical cyclones. Wildfires swept through the Arctic and Australia,” added Taalas.

“One of the main impacts of climate change is more erratic rainfall patterns. This poses a threat to crop yields and, combined with population increase, will mean considerable food security challenges for vulnerable countries in the future,” he said. The global mean temperature for the period January to October 2019 was 1.1 ± 0.1 °C above pre-industrial conditions (1850-1900). The five-year (2015-2019) and ten-year (2010-2019) averages are, respectively, almost certain to be the warmest five-year period and decade on record.

2019 is expected to be the second or third warmest year on record. 2016, which began with an exceptionally strong El Niño, remains the warmest year.

Large areas of the Arctic were unusually warm in 2019. Most land areas were warmer than the recent average, including South America, Europe, Africa, Asia and Oceania. The report devotes an extensive section to weather and climate impacts on human health, food security, migration, ecosystems and marine life.