is our number up?

Would contact with extraterrestrials benefit or harm humanity? … ecosystem-valuing universalist ETI may observe humanity’s ecological destructive tendencies and wipe humanity out in order to preserve the Earth system as a whole.

These scenarios give us reason to limit our growth and reduce our impact on global ecosystems.It would be particularly important for us to limit our emissions of greenhouse gases, since atmospheric composition can be observed from other planets.

Would contact with extraterrestrials benefit or harm humanity? A scenario analysis,, Seth D. Baum, Jacob D. Haqq-Misra, Shawn D. Domagal-Goldman, Acta Astronautica (2011) 68:2114-2129

thanks to Andrew Mark Harding