Summary of “Fermi paradox: why haven’t we found aliens yet?”

The universe continues to appear devoid of life.
In early June, Anders Sandberg, Eric Drexler, and Toby Ord of the Future of Humanity Institute released a paper that may solve the Fermi paradox – the discrepancy between our expected existence of alien signals and the universe’s apparent lack of them – once and for all.
While the findings are helpful for thinking about the likelihood of aliens, they may be even more important for reframing our approach to the risk of extinction that life on Earth may face in the near future.
In a universe that had been around for some 14 billion years, and in that time developed more than a billion trillion stars, Fermi reasoned there simply must be other intelligent civilizations out there.
Life can’t be that rare, can it? To be clear, the paper’s authors do not appear to be making any definitive claim about whether or not aliens exist; simply, our current knowledge across the seven parameters suggests a high likelihood of us being alone.
We exist, along with other intelligent life like dolphins and octopi, so we assume what we see must be extrapolatable beyond Earth.
Whether the true likelihood is as high as one in two, or as inconceivable as one in a trillion trillion trillion, the mere ability to consciously ask ourselves that question depends on the fact that life has already successfully originated.
As we only have one data point, we have no reliable way to predict the true likelihood of intelligent life.

The orginal article.