Carbon emissions are more dangerous than I thought!

Thanks to James Taranto for the pointer to this beautiful piece from the Guardian:

Aliens may destroy humanity to protect other civilisations, say scientists
Rising greenhouse emissions could tip off aliens that we are a rapidly expanding threat, warns a report


It may not rank as the most compelling reason to curb greenhouse gases, but reducing our emissions might just save humanity from a pre-emptive alien attack, scientists claim.

Watching from afar, extraterrestrial beings might view changes in Earth's atmosphere as symptomatic of a civilisation growing out of control – and take drastic action to keep us from becoming a more serious threat, the researchers explain.
[...]
"Green" aliens might object to the environmental damage humans have caused on Earth and wipe us out to save the planet. "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," the authors write.

It's science! Little green men are green in more ways than one.