When shelter-in-place orders went into effect in California, human activity ground to a halt.
That got listener Anne-Marie Roschè in Berkeley thinking: “What impact does this change in human behavior have on the rest of the ecosystem?”
It’s early yet, but scientists are starting to see some effects.
Bay Curious caught up with Kevin Stark, from KQEDâs science team, who has been following this story.
Emissions & Air Pollution
Car traffic is the Bay Area’s main source of air pollution. One estimate found traffic over the Bay Area’s bridges during rush hour is down by 70-percent. Local air regulators say that decrease in traffic would result in a potential 20-percent reduction in fine particulates and a 38-percent drop in nitrogen oxides. Carbon dioxide emissions, the leading driver of climate change, would be down 26-percent.
According to Meg Thurlow at Aclima, a San Francisco-based air quality mapping startup, says that Bay Area pollution levels have continuously declined since March 17, when many counties initiated stay-at-home orders.
Graphic by Aclima.
Shipping accounts for air quality problems in some parts of the Bay Area â specifically in West Oakland where diesel smoke from semi-trucks picking up goods settles into the neighborhood. But with shipping traffic down by 11-percent, the air in that neighborhood has improved. Aclima has found West Oakland’s CO2 levels have dipped under the Bay Area’s regional average.
Read more: Bay Area Pollution Way Down, Air District Estimates
Global Trends
Weâre seeing an impact on carbon emissions on a global level, too. By one estimate, the pandemic could result in a 5.5-percent drop in worldwide carbon emissions this year. And the U.S. Energy Information Administration projects the country’s emissions from gas and energy could decrease by 7-percent.
But even with the pause in traffic and industry, scientists say it’s not enough to prevent the worst impacts of climate change. The United Nations has said emissions must be reduced by about 7.6-percent each year to pause the effects of climate change.
Read more: After the Coronavirus, the Climate Crisis Will Remain. What Have We Learned?
Wildlife
Animals also seem to be reaping some rewards during this time, pushing into areas they typically avoid because of human activity or noise. There have been and uptick of coyote sightings in San Francisco on social media. Yosemite park rangers say bears are coming out more frequently. In Australia, kangaroos have been caught on camera hopping about on city streets.
Yosemite National Park on Twitter Yosemite National Park is home to about 300-500 black bears. Though there hasn’t been an increase in their population since the park closure, bears have been seen more frequently than usual. Check out this bear caught on camera yesterday, climbing a tree next to ranger housing! https://t.co/9rXxIOMRbR
Yosemite National Park on Twitter It could be said that spring, summer, and fall are just one big meal to a black bear. If that’s the case, then grass is a bear’s favorite springtime appetizer! Check out this bear that we spotted yesterday around lunchtime, mowing the grass just across from Yosemite Village! https://t.co/Gcgn184lyY
Capturing Gains
While it’s promising to read about these environmental benefits, it’s important to recognize that these gains are likely temporary, unless action is taken to either move toward cleaner energy or reduce our need for energy. Still, this period of time may provide insights that will help leaders at all levels map out a cleaner future.
Read more:
Plummeting Carbon Emissions Are a Temporary Thing. Renewable Energy Could Make This the Future After the Coronavirus, the Climate Crisis Will Remain. What Have We Learned?
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