COVID-19 won’t impact climate much, but economic recovery could

Enlarge / India saw a notable decline in aerosol pollution in April. (credit: NASA EO)

Given the radical changes people have undertaken to limit the spread of COVID-19 (hello month six of quarantine-except-for-groceries), many have naturally wondered what impact this has had on pollution, including greenhouse gases and climate change. Some short-lived pollutants dropped noticeably during the strong lockdowns of April, as businesses shuttered and travel was reduced. But CO₂ levels don't fluctuate based on short-term events like that, so the long-term effect on climate change was expected to be trivially small-assuming economies rebounded fairly quickly.

A new study led by the University of Leeds' Piers Forster (and his daughter Harriet) takes advantage of phone location data to re-examine the first six months of the year, tracking more than just CO₂. While they ultimately find that the impact has been small, their results also highlight that the way economies choose to rebound could have a much bigger effect over the long term.

The work relies on mobility data made public by Google and Apple, covering 114 countries. Using that along with energy and emissions datasets, the researchers converted behavior changes into pollution changes. The phone data records changes in transportation use quite well, although purported changes in activity between residential, commercial, and industrial settings are harder to relate to energy. The researchers compared the changes they saw in their phone data to a May study that estimated April emissions using things like utility data. They found their phone-based estimate of home energy use probably overestimates the real change.

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