How do hydrogen bombs work?

Question

How do hydrogen bombs work?

Answer 1

They use the heat of a fission bomb (splitting plutonium atoms) to fuse hydrogen atoms which releases much more energy than the fission alone

So a hydrogen bomb is a combined atomic bomb with deuterium  

Answer 2

Fusion (not fission) of hydrogen atoms. The Teller Ulam design uses a fission device to trigger the fusion reaction. See http://en.wikipedia.org/wiki/Hydrogen_bo...

Answer 3

I do not have all the facts, but have been told that they destroy people and not buildings, which may be more economical for war.