[kristianov]

We won't be able to recognize intelligence if it is not anthropocentric. The Earth could be sentient but we won't be able to tell.

[Qem]

That is the premise of Solaris, from Stanislaw Lem. Great book, and movie too (the original, not the remake).

[arethuza]

I think David Brin's novel Earth had something similar - a book that I mostly remember for its version of WW3 being everyone vs Switzerland.