The coronavirus is a virus that expands very easily. If someone has the virus, he won't know that he has the virus until two weeks later, when he starts to have symptoms. So, if someone has the virus, this person won't know that he has the virus for two weeks. During this period of time this person will infect more people, and these people will infect more and more people.
Because of this many governments of different countries have told people that they have to stay home. In some countries they have to stay home for two weeks and in other countries they have to stay for four weeks, usuallu because these countries have more cases of coronavirus.
Now, there aren't people in the streets, so lately we have been finding animals walking in the streets, like bears or goats, and there is less pollution in the streets. In Venice the water is as clear as 60 years ago!
In my opinion pollution is reducing because many factories are closed and there is less traffic. I think we can learn something and change our lifestyle when this quarantine ends. I think that people will like to see their cities less polluted and the water so clear and they'll probably try to walk to different places and not to use the car.
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