9. The Fermi Paradox
Giorgio was asked about this very scenario and here was his response...
"The Fermi Paradox is an incredibly important observation. However, we have to understand that providing extraterrestrials exist, and providing that they have been here in the past, and are currently either observing or even still visiting us, their technology is so far beyond what we can even imagine - the idea or the suggestion that, you know, "if they exist, where are they" (which the Fermi Paradox suggests), just because we cannot see them does not mean they are not here - because their technological capabilities would allow them to essentially appear invisible to us."
Of course he wouldn't rule out aliens. That is expected. He does not seem open to the idea that Earth is alone, though. But as far as the current scientific consensus is concerned it is.