If it's not nuclear weapons, then there must exist technologies that are sure on our path to discovery while at the same time guaranteeing our extinction--again, think in terms of things that only need one outlier to use it in a way that compromises the existence of all on Earth for good.
How about hydrocarbon fuels? They don't need one outlier. They seem to have chemistry and physics resulting in an economic trap for t heir use.
1. The worst-case "predictions" of the doomiest environmentalists are that the shoreline will move in a bit, and the tropics will get a bit iffy.
2. Hydrocarbons are a temporary religious dogma, not a trap. There are collosal amounts of thorium waiting to be tapped when the energy religion is reformed.
... and that large swaths of the Earth receive new weather patterns completely disrupting nearly every ecosystem, with cascading effects including no food for us
How about hydrocarbon fuels? They don't need one outlier. They seem to have chemistry and physics resulting in an economic trap for t heir use.