Should we be looking for intelligence on a planetary scale?

For more than sixty years, humanity has been searching the cosmos for evidence of extraterrestrial intelligence.

While our efforts have been limited, and the results less than encouraging, that may be about to change. With thousands of exoplanets discoveries in the last two decades alone and next-generation telescopes becoming available, major breakthroughs are expected to happen soon. These surveys will be a chance to test various theories that have been advanced over the years.