I had to check the date reading this Business Green article about aliens and rising greenhouse emissions. It makes interesting, if somewhat bizarre reading, and comes from a report entitled Would Contact with Extraterrestrials Benefit or Harm Humanity? A Scenario Analysis. It contains, apparently:
a list of plausible outcomes that could unfold in the aftermath of a close encounter, to help humanity “prepare for actual contact”
So there you are. Don’t worry about a torch by the door and three tons of baked beans in the cellar, instead show the aliens what you’ve been doing for the planet and everything will be just fine.