Would contact with extraterrestrials benefit or harm humanity? A scenario analysis

While humanity has not yet observed any extraterrestrial intelligence (ETI), contact with ETI remains possible. Contact could occur through a broad range of scenarios that have varying consequences for humanity. However, many discussions of this question assume that contact will follow a particular scenario that derives from the hopes and fears of the author. In this paper, we analyze a broad range of contact scenarios in terms of whether contact with ETI would benefit or harm humanity. This type of broad analysis can help us prepare for actual contact with ETI even if the details of contact do not fully resemble any specific scenario. Source Cornell University

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

To bolster humanity’s chances of survival, the researchers call for caution in sending signals into space, and in particular warn against broadcasting information about our biological make-up, which could be used to manufacture weapons that target humans. Instead, any contact with ETs should be limited to mathematical discourse “until we have a better idea of the type of ETI we are dealing with.”

The authors warn that extraterrestrials may be wary of civilisations that expand very rapidly, as these may be prone to destroy other life as they grow, just as humans have pushed species to extinction on Earth. In the most extreme scenario, aliens might choose to destroy humanity to protect other civilisations.

“A preemptive strike would be particularly likely in the early phases of our expansion because a civilisation may become increasingly difficult to destroy as it continues to expand. Humanity may just now be entering the period in which its rapid civilisational expansion could be detected by an ETI because our expansion is changing the composition of the Earth’s atmosphere, via greenhouse gas emissions,” the report states.Source Guardian

Let’s assume they spotted us and let’s assume they tap our communications. What should they think of us? We kill each other, we destroy the very habitat which sustains our and the existence of billion other forms of life. Also consider that habitable planets such as Earth are rare, very rare. Should they watch how we destroy the planet, probably initiating one of the greatest extinction events in earth history. Or should they take actions?