It produces more fallout. A hydrogen bomb is two bombs in one. The first is a plutonium device that acts as a spark to create massive amounts of heat and pressure quickly to kick off the second part, which is the fusion of the hydrogen. And that hydrogen part usually uses a lot of uranium as part of its construction. So, even though much of the explosive energy comes from the fusion of hydrogen, there is still fallout produced from the fissioning of uranium and plutonium.
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