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Home » Transcript: Nuclear Expert Ivana Hughes’ Interview on Tucker Carlson Show

Transcript: Nuclear Expert Ivana Hughes’ Interview on Tucker Carlson Show

Read the full transcript of Nuclear Age Peace Foundation’s president Dr. Ivana Hughes’ interview on The Tucker Carlson Show on “How Launching a Single Nuke Could Wipe Out All of Humanity”, October 17, 2025.

TUCKER CARLSON: Thank you, professor, for doing this. Let me start with the most simple of all questions. How are nuclear weapons different from conventional weapons?

The Fundamental Difference Between Nuclear and Conventional Weapons

DR. IVANA HUGHES: Nuclear weapons are different from conventional weapons in many ways. One of the things that I like to say is that they really defy the kind of concept of both space and time. And let me explain what I mean by that.

If you have a conventional weapon and you explode it over a city wherever, that explosion is going to have an impact in that local place, and it’s going to have that impact in time, and then you could come back and clean up the area and rebuild and so on. Nuclear weapons are not like that.

A nuclear explosion in one place, in one location, and in one split moment of time can have both global effects and it can have impacts over actually even thousands of years through the effects of radiation and the kind of radioactive isotopes that get deposited in the environment there.

There are a number of ways in which even a single nuclear weapon explosion can be incredibly dangerous and devastating. And then there are a number of impacts in which a nuclear war in which many nuclear weapons are used can be, obviously, quite clearly, much more devastating.

The Devastating Power of a Single Nuclear Weapon

So the thing that people know about nuclear weapons is that one nuclear weapon can be much more powerful than any kind of chemical explosion. For example, the atomic bombings of Hiroshima and Nagasaki 80 years ago, almost exactly, had what’s called energy yields of 15 and 21 kilotons of TNT.

Now, these bombs were made out of uranium and plutonium—uranium for the Hiroshima bomb and plutonium for the Nagasaki bomb. But when we describe their energy yield, we describe it in terms of the equivalent amount of chemical explosive that you would need. So that’s where the 15 kilotons, 15,000 tons of TNT, how much you would have needed of chemical explosives to produce the energy equivalent to that explosion. And that in and of itself is huge.

Just to give you one kind of point of comparison, the Oklahoma City bombing, which I’m sure you remember—it was actually the first year that I was living in the United States. It was in April of 1995, and it was a devastating event. It was the equivalent of two and a half tons of TNT.

So Timothy McVeigh had filled the Ryder truck with chemical explosives, lit it up outside of a federal building, killed 168 people, including 19 children in a daycare center. And there was damage in a radius of up to, I think, 16 blocks, something of that order. So absolutely an incredible and devastating event.

At the same time, that explosion was 6,000 times less energetic than the bombing of Hiroshima. So 15,000 tons of TNT versus two and a half tons of TNT. So that just begins to give you a scale for just how powerful a single nuclear weapon can be.

And then on top of it is that we now have weapons that are far more powerful than the Hiroshima and Nagasaki bombs. In fact, in 1945, the US had three nuclear weapons. One was used as a “test,” the Trinity test, in the desert of New Mexico. And then two were used on the attacks on Japanese cities of Hiroshima and Nagasaki. Today we actually have on the order of 12 and a half thousand nuclear warheads, many of which are far more powerful.

TUCKER CARLSON: How much more powerful?

Modern Nuclear Weapons: Thousands of Times More Destructive

DR. IVANA HUGHES: So we know that both US and Russia have nuclear bombs currently that are on the order of one megaton. That’s about 70 times more powerful than the Hiroshima bomb.

At the height of the Cold War, when we were first testing nuclear weapons and actually first testing hydrogen bombs, which are different from the atomic bombs that were used in Hiroshima and Nagasaki—and I can explain that as well—we were even testing… The largest test that the US had ever conducted took place in the Marshall Islands. It’s called the Bravo Test, Castle Bravo test. And there was 1,000 Hiroshima bomb equivalents.

And yet the Soviets actually tested something even more powerful. They did so up in the North Sea region called Novaya Zemlya. And they tested, some accounts say, 50 megatons. So that’s more than 3,000 Hiroshima bombs equivalents. I’ve even seen accounts to say 58 megatons. So that would be basically 4,000 Hiroshima bomb equivalents.

The Castle Bravo Test, which took place on March 1st of 1954—that test, that mushroom cloud… So we all have this vision of a nuclear explosion that produces the mushroom cloud. That mushroom cloud was 25 miles or 40 kilometers high, and at the widest, about 60 miles wide. 60 miles wide. The mushroom cloud, it’s quite simply something that’s unimaginable.

The Long-Term Consequences: Radiation That Lasts Decades

And that test actually had truly devastating consequences for people living in the Marshall Islands. About 100 miles from where the test was conducted, the population was living in a place called Rongelap Atoll. And those people were very severely impacted by the test. It’s a long story. They stayed there for three days. They were moved away.

But to kind of cut to the present day, and this is actually from some of the research that I’ve done with colleagues and students at Columbia University, currently, there’s still parts of the Marshall Islands where radiological contamination is very high. And that testing ended in 1958.