Thousands of Scientists Warn Climate Tipping Points 'Imminent'
mercredi 28 juillet 2021, 19:41 , par Slashdot
Thousands of scientists have repeated calls for urgent action to tackle the climate emergency, warning that several tipping points are now imminent. From a report: The researchers, part of a group of more than 14,000 scientists who have signed on to an initiative declaring a worldwide climate emergency, said in an article published in the journal BioScience on Wednesday that governments had consistently failed to address 'the overexploitation of the Earth,' which they described as the root cause of the crisis. Since a similar assessment in 2019, they noted an 'unprecedented surge' in climate-related disasters, including flooding in South America and Southeast Asia, record-shattering heatwaves and wildfires in Australia and the US, and devastating cyclones in Africa and South Asia.
For the study, scientists relied on 'vital signs' to measure the health of the planet, including deforestation, greenhouse gas emissions, glacier thickness and sea-ice extent and deforestation. Out of 31 signs, they found that 18 hit record highs or lows. For example, despite a dip in pollution linked to the COVID-19 pandemic, levels of atmospheric CO2 and methane hit all-time highs in 2021. Greenland and Antarctica recently showed all-time low levels of ice mass and glaciers are melting 31-percent faster than they did just 15 years ago, the authors said. Ocean heat and global sea levels set new records since 2019, and the annual loss rate of the Brazilian Amazon reached a 12-year high in 2020. Echoing previous research, the researchers said forest degradation linked to fire, drought and logging was causing parts of the Brazilian Amazon to now act as a source of carbon, rather than absorb the gas from the atmosphere.
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