According to news reports a few weeks ago, North Korea has tested a hydrogen bomb over the Pacific Ocean with regards to the comments that were made by Donald Trump when he ordered new sanctions on individuals, companies, and business who choose to do business with notoriously solitary countries.
Hydrogen bombs are way more powerful than atomic bombs. The difference between thermonuclear bombs and fission bombs begins at the atomic level. One cannot forget the hazards caused by these fission bombs when they hit Hiroshima and Nagasaki in world war 2.
Thermonuclear bombs originate at the same level as those of an atomic bomb but if you study closely, most of the uranium or plutonium in atomic bombs go unused but in the Thermonuclear bomb, the intensity will rise to almost 20 times of an atomic bomb.
The first test of a thermonuclear weapon, or hydrogen bomb, in the United States in November 1952 yielded an explosion on the order of 10,000 kilotons of TNT.
First, an igniting explosion compresses a sphere of plutonium-239, the material that will then undergo fission. Inside this pit of plutonium-239 is a chamber of hydrogen gas. The high temperatures and pressures created by the plutonium-239 fission cause the hydrogen atoms to fuse. This fusion process releases neutrons, which feed back into the plutonium-239, splitting more atoms and boosting the fission chain reaction.
Governments around the world use monitoring systems to detect any kind of nuclear activity since the treaty of 1996 Comprehensive Test Ban Treaty (CTBT) was signed by almost 186 countries. Since, 1996, Pakistan, India and North Korea have performed atomic testing but since North Korea was quite, in fact, serious about testing this bomb, if it does and World War 3 takes place, there be much bigger explosion then the previous one and millions of lives will be lost.