They will find their way to a small refuge designed for this purpose, where they will find intense heat, filth and about enough food for two men for 10 days.
Now, there was nothing particularly special about 2010, because, on average, 31 and a half million people are displaced by natural disasters every single year.
So the question is, which camps are at risk, how many people are in these camps, what's the timeline for flooding, and given very limited resources and infrastructure, how do we prioritize the relocation?
While it's true that many who died in Katrina did not have access to transportation, others who did refused to leave as the storm approached, often because available transportation and shelters refused to allow them to take their pets.
It's a place where your data can be free, so when we think about, increasingly, how governments want to access user data, what they're trying to do in Iceland is make this safe haven where it can happen.
A few weeks later, my friend was in a crowd of people pushing with her infant son in her arms to give him to a stranger on a bus, which was one of the last buses leaving Sarajevo to take children out so they could be safe.
And she said, "In Mr. Kearney's geography class last month, he told us that when the tide goes out abruptly out to sea and you see the waves churning way out there, that's the sign of a tsunami, and you need to clear the beach."
They're so poor, and they are freezing with blankets during the rainy season, In the shelters built by the U.N., they were just providing a plastic sheet, and the refugees had to cut the trees, and just like this.
Now everybody agrees that thyroid cancers are sky high, and that Chernobyl evacuees suffer the trauma of relocated peoples everywhere: higher levels of anxiety, depression, alcoholism, unemployment and, importantly, disrupted social networks.
Over and well over three million people have crossed the borders and have found sanctuary in the neighboring countries, and only a small proportion, as you see, have moved on to Europe.
(Laughter) And then I went to a golf course in Shenzhen, which is in southern China, and you can see from this banner, they're advertising a retreat from PM2.5.
There, a guard came to me, very close -- it was quite unusual -- and he said with a very soft voice, he said, "I'd like to thank you for the assistance your organization provided my family when we were displaced in nearby Dagestan."
This is the same for us when we help refugees, people displaced within their country by conflict, or stateless persons, I know many people, when they are confronted by overwhelming suffering, they feel powerless and they stop there.
How did my country -- a country with communities living harmoniously together and comfortable in discussing their differences -- how did it degenerate into civil war, violence, displacement and unprecedented sectarian hatred?
So for the past five years, myself and my colleagues -- Prof. Calam and Dr. Kim Cartwright -- have been working on ways to support families that have experienced war and displacement.
Finding shelter is especially important if the fireball occurs close to the earth, as it will pull thousands of tons of dirt and debris several kilometers into the atmosphere.
Since the most hazardous fallout particles are the heaviest, they sink through the air and collect on streets and rooftops, making ideal shelters underground or in the middle of high-rise buildings.
And I'm telling you, I actually testified at the Senate about the absolute ludicrous idea that we would actually evacuate, and actually have three or four days' warning.
The idea was that we would force the Soviets to re-target their nuclear weapons -- very expensive -- and potentially double their arsenal, to not only take out the original site, but take out sites where people were going.
Once you're out and evacuating, you want to keep as much of your skin, your mouth and nose covered, as long as that covering doesn't impede you moving and getting out of there.
On the one hand, the internally displaced population will start returning to their lands, and on the other hand, hidden land mines are going to start exploding more often on the civilian side.
Global cooperation as a response to global migration and displacement would go a long way towards making migration something that isn't a crisis but something that just is, and that we deal with as a global community.