The meteor that nearly killed the dinosaurs is estimated to have contained 420 zettajoules of energy in its impact, and to have killed to extinction 75% of all

The meteor that nearly killed the dinosaurs is estimated to have contained 420 zettajoules of energy in its impact, and to have killed to extinction 75% of all plant and animal species on Earth. There are some 13_000 nuclear weapons currently in the world. If we assume they are all equivalent to the largest one ever tested (210 petajoules), they would in aggregate contain 2.73 zettajoules of energy, or 0.65% of the meteor. Maybe you're right, we don't have the capacity to blow up the Earth quite yet.