You need to add looking for another livable planet to the list. More energy * More people = more energy to dissipate. Eventually, even with the cleanest energy

You need to add looking for another livable planet to the list. More energy * More people = more energy to dissipate. Eventually, even with the cleanest energy sources and the highest efficiencies, humanity's energy production will be too great for the planet to support. Since we don't have a planet lined-up for colonization and temperatures are already threatening stability - we need to deal with the first half of the equation before nature does it for us.