Exterminating humans can be done without acting on humans directly. We are fragile meatbags, easily destroyed by an inhospitable environment. For example:
Raise CO2 levels to cause a runaway greenhouse effect (hard to do quickly though).
Use up enough oxygen in the atmosphere to make breathing impossible, through some runaway chemical or physical process.
There have been plenty of discussions on “igniting the atmosphere” as well.
Exterminating humans can be done without acting on humans directly. We are fragile meatbags, easily destroyed by an inhospitable environment. For example:
Raise CO2 levels to cause a runaway greenhouse effect (hard to do quickly though).
Use up enough oxygen in the atmosphere to make breathing impossible, through some runaway chemical or physical process.
There have been plenty of discussions on “igniting the atmosphere” as well.