So, in China, carbon dioxide emissions have dropped by as much as 100 million cubic tons in the last two weeks.
That's almost six percent of global emissions.
The rapid spread of the new coronavirus, which has killed more than 2000 in China and infected over 74,000 people.
Environmentalists warn that the reduction is only temporary.
"Once the coronavirus has subsided, we are very likely to face increased production that will seek to compensate for the losses," Li Shuo said.
Meanwhile, emissions of nitrogen dioxide, a by-product of fossil fuel combustion in vehicles and power plants, fell 36 percent in China the week after New Year's holidays. As for the rest of the world, the situation is quite similar.
In most cities, as far as Europe is concerned, people mostly stick to the rules and stay in their homes.
The cities are empty but also cleaner.
In some countries wild animals are walking the streets, and there are no people at all.
The current environmental situation is actually much better than it was, but that can all change.
Do you think will the environment become polluted or cleaner?