"Rising greenhouse emissions may tip off aliens that we are a rapidly expanding threat, warns a report for Nasa"
REALLY!
Greenhouse gasses is what tips them off?
Are their not planets naturally abundant with greenhouse gasses?
I'm guessing the
massive neutron bursts in space over our planet were
not the first tip off we mean business?
""Green" aliens might object to the environmental damage humans have caused on Earth and wipe us out to save the planet." And just how will they wipe us out without harming the planet? We'll nuke their little gray asses the moment they land (See:
Footfall)! See how they like the environmental damage from THAT!