Muad'zin
Fractal Fanatic
I attended a lengthy live seminar with James Green a couple of years ago and it was utterly fascinating. He laid out and explained in great detail how they are going about finding evidence of life on other planets/moons, how they quantify 'life', the conditions they think are required to support life, how they identify candidate bodies to explore, and why he thinks they will discover life in our solar system within the next few years. It was a very compelling, factual, and evidence based presentation....one that made you wonder and think. He outlined the discovery missions they are working on and why NASA thinks Europa is a prime candidate to explore (it consists of every metric NASA defines as 'able to support life').
There are some who think that Callisto is a far better candidate as its also considered to have an ocean underneath the ice, but unlike Europa and Ganymede its not within Jupiter's radiation belt.
I still think there is a major difference between 'we've found life on one of the other planets or moons' vs. 'we've found life and it asked us to take it to our leaders'. Microbial or very basic organism on other worlds in our solar system is nice, but hardly impacts our lives one iota. Intelligent life elsewhere does make a major difference, even when its thousands of lightyears away. If only because at some point in the future humanity will have to deal with these foul xenos.