Aliens Have Pollution

From AZRainman: Photoshop Satire

So what else are they hatching?

How to Find Aliens? Look for Pollution on Other Planets Discover Magazine

Scientists have proposed what seems like an obvious solution to finding life on other planets—look for pollution similar to that found on Earth. Light or air pollution would be a dead giveaway to life on another planet, according to a study to appear in the journal Astrobiology.