Critical measures of global heating reaching tipping point, study finds

The Guardian

By Katharine Gammon
Vast areas of the Amazon rainforest are being burned and cleared for grazing cattle — a double blow to global warming, as cattle produce methane and cleared forests release carbon into the atmosphere. Photograph: Florian Kopp/imageBROKER/REX/Shutterstock

A new study tracking the planet’s vital signs has found that many of the key indicators of the global climate crisis are getting worse and either approaching, or exceeding, key tipping points as the earth heats up.

Overall, the study found some 16 out of 31 tracked planetary vital signs, including greenhouse gas concentrations, ocean heat content and ice mass, set worrying new records.

“There is growing evidence we are getting close to or have already gone beyond tipping points associated with important parts of the Earth system,” said William Ripple, an ecologist at Oregon State University who co-authored the new research, in a statement.

“The updated planetary vital signs we present largely reflect the consequences of unrelenting business as usual,” said Ripple, adding that “a major lesson from Covid-19 is that even colossally decreased transportation and consumption are not nearly enough and that, instead, transformational system changes are required.”

While the pandemic shut down economies and shifted the way people think about work, school and travel, it did little to reduce the overall global carbon emissions. Fossil fuel use dipped slightly in 2020, but the authors of a report published in the journal BioScience say that carbon dioxide, methane and nitrous oxide “have all set new year-to-date records for atmospheric concentrations in both 2020 and 2021”.

Publish : 2021-07-28 14:40:00

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