How many cities have been nuked

The following images created using Wellerstein's simulation tool show how each of the six cities Redlener named would be affected by a kiloton blast — the kind detonated over Hiroshima during World War II. The simulations use data from the Oak Ridge National Laboratory which is sponsored by the US Department of Energy that shows how many people are likely to inhabit an area within a hour period. Wellerstein previously told Business Insider that his tool was meant to give people "a realistic understanding of what nuclear weapons can and can't do.

The models, for instance, don't take into account weather conditions, which can affect the altitude of a mushroom cloud. Yellow : Fireball foot radius — Less than one-millionth of one second after a bomb exploded, it would emit a giant orange fireball filled with hot air and weapon debris.

Any buildings, objects, and people caught within this radius would likely burst into flames. Green : Radiation 0. Nuclear fallout can expose people to radiation poisoning, which can damage the body's cells and prove fatal.

Blue-gray : Air blast 1. There would likely also be widespread injuries and fatalities within this radius. Orange : Thermal radiation 1. That blast would also miss two of the city's iconic waterside landmarks: the Ferry Building and Fisherman's Wharf.

About 65, Houston residents could also be injured from a Hiroshima-like blast — the smallest total of injuries on this list. Since Los Angeles is a sprawling city, Beverly Hills and neighborhoods like West Hollywood would be relatively safe in this simulation. The air blast could be strong enough to damage the White House and Washington Monument, according to Wellerstein's simulation.

Those visiting the Cloud Gate sculpture better known as "The Bean" could experience third-degree burns. If the fireball were centered near SoHo, as shown above, Chinatown and the area around Washington Square Park would be exposed to radiation.

Parts of the Financial District would also see thermal radiation. For you. And North Korea continues to test and develop its nuclear programme with missile tests as recent as October. So while the world may have fewer nukes today than it did 30 years ago, it doesn't look like you'll be seeing a complete end any time soon.

Listen to Newsbeat live at and weekdays - or listen back here. Reality Check: Where are the world's nuclear weapons? The Iran nuclear deal explained in five key points. Iran rolls back nuclear deal commitments. Image source, Getty Images. What are nuclear weapons? They are extremely powerful explosives. They haven't been detonated in war since then. This video can not be played To play this video you need to enable JavaScript in your browser.

Who can develop them? A mushroom cloud which is an effect of a nuclear explosion. So where does Iran fit in? What are sanctions and why do countries use them? Iran's President Hassan Rouhani has previously said they would not pursue nuclear weapons. Three reasons behind Trump ditching Iran deal. Kurzgesagt estimates that if the world's supply of nukes were used evenly on its large cities, the global arsenal would be enough to kill three billion people, with 1, nukes left over. Packed inside a single, sprawling warehouse in the South American jungle, as Kurzgesagt imagines, they collectively have the power of up to 15 Krakatoa -style volcanic eruptions.

The detonation of this super warehouse would create a fireball 31 miles across, flattening 1, square miles surround it. A mushroom cloud 30 miles high would follow. The nuclear firestorm would expand in all directions across South America ironic and a bit unfair, considering South America is one of the few continents without nuclear weapons.

It would also be followed by a nuclear winter scenario, in which particles of dust and ash sent skyward would enter the upper atmosphere, blocking sunlight and lowering temperatures globally for several years. What if humanity mined every bit of uranium from the Earth—approximately 35 million tons?

As the ensuing animation demonstrates, that would be an extinction-level event on par with the asteroid that ended the Age of the Dinosaurs.