The Drake equation is simply the product of a set of factors, estimating the number of active, technologically advanced, communicating civilizations in our galaxy.
“Not exactly proof” of extraterrestrial life, they say? It’s not a “proof” at all.
The authors argue that RNA molecules appeared in warm little ponds more than 4.17 billion years ago, transported by “meteorites and interplanetary dust particles.”
“Warm little ponds,” in Darwin’s quaint expression, are actually very hostile environments for generating nucleotides.