A form of Nuclear Fart Fusion we will pump enough gas into our atmosphere and some granny will turn on her microwave with a faulty door and when it dings, it will start a a chain of events beginning with a fission fart "trigger" radioactive particles will result from that. creating the high energy that is required to bring two or more protons close enough that nuclear forces overcome their electrostatic repulsion. thus ending life as we know it.
P.s stop eating cabbage.