In Venice, the often murky canals recently began to get clearer, with fish visible in the water below. Italy's efforts to limit the coronavirus meant an absence of boat traffic on the city's famous waterways. And the changes happened quickly.
https://www.nbcnews.com/science/environment/coronavirus-shutdowns-have-unintended-climate-benefits-n1161921
https://www.nbcnews.com/science/environment/coronavirus-shutdowns-have-unintended-climate-benefits-n1161921