A report rolled out by one of NASA’s scientists has suggested that the Earth's rising levels of greenhouse gases could provoke an alien attack.

The scenarios have been discussed in the paper written by Shawn Domagal-Goldman of Nasa's Planetary Science Division and Pennsylvania State University academics, which says that by using spectrometry, extraterrestrials could detect changes in Earth's atmosphere and deduce that we're out of control. It's one of a number of scenarios discussed.

“There have been many previous analyses of and commentaries on how contact with ETI (extra-terrestrial intelligence) would proceed. Unfortunately, this previous work tends to be quite narrow in the sense of only considering one or a small number of possible contact outcomes. There appears to be a tendency to jump to conclusions on a matter which remains highly uncertain and for which a broad range of outcomes are within the realm of possibility,” the authors say.

“Such narrow and hasty thought ill prepares us for actual contact. Instead, given the extremely broad range of possible contact outcomes, we would be much better prepared by identifying and thinking through a broad range of possible contact outcomes.”

The authors added that a preemptive strike would be particularly likely in the early phases of expansion because a civilization may become increasingly difficult to destroy as it continues to expand. They, however, said that if humanity did get attacked by aliens, it's possible that another bunch might fly in to save them.

“If contact between humans and ETI is possible, then it is important to consider the capability of ETI to cause us benefit or harm. This information is important across nearly the full breadth of contact scenarios,” the authors further added. “Although we cannot know the level of technological sophistication achieved by ETI, we do have a compelling reason to believe that ETI would be significantly stronger than us and therefore highly capable of causing our total destruction. This point has been raised repeatedly throughout the literature.”

Domagal-Goldman, later, made it clear that the study was not a NASA report and that no NASA funding was expended on it. He also said that his two co-authors, Seth Baum and Jacob Haqq-Misra of Pennsylvania State University worked on it.

“Yes, @drudge & @guardiannews are mistaken about an alien report. It's not NASA research. Ask the report's author go.nasa.gov/nRI8Lf,” NASA later clarified in their official Twitter account, TG Daily reported.