Even the use of the word "unprecedented" is unprecedented - it's been used three times as often in the last two weeks compared to the highest previous point.

Covering flights, traffic, pollution and home-working, we take a look at the world in lockdown.

https://www.bbc.co.uk/news/world-52103747

Asia was hit first, and there was surprise from outside at the strict rules to try and contain it.

But as the pandemic spread globally, nations reacted more quickly and more strictly to their own first cases.

Only China have managed to ease measures.

https://www.bbc.co.uk/news/world-52103747

The number of flights from the world's major airports have dropped massively, with Asia first to close down again.

There were one-third as many flights to and from London Heathrow compared to an equivalent day last year.

https://www.bbc.co.uk/news/world-52103747

It's not just travel between countries grinding to a halt.

Journeys within the world's major cities have plummeted, even where there aren't official lockdowns yet.

In London, New York and Paris people made less than one tenth as many trips as normal.

https://www.bbc.co.uk/news/world-52103747

The same is true for road traffic. The effect of lockdown measures is clear but people were already slowing down beforehand, and in places where there are no restrictions.

Beijing and Shanghai show signs of steadily returning to normality.

https://www.bbc.co.uk/news/world-52103747

One of the few positive notes to come from the pandemic is that pollution levels have dropped off.

In many parts of the world it's too soon to tell whether the early signs are lockdown-related, but in Wuhan and northern Italy we can be more certain.

https://www.bbc.co.uk/news/world-52103747

Under lockdown, working from home is becoming the norm and people are working out new ways to communicate with colleagues.

Users of instant-messaging platform Slack were sending one-third more messages in late March than they were the month before.

https://bbc.co.uk/news/world-52103747