How much of that 10^24 is required to power earth's ecosystem though? Not that this is relevant now, but I could see it becoming relevant when/if we move toward

How much of that 10^24 is required to power earth's ecosystem though? Not that this is relevant now, but I could see it becoming relevant when/if we move towards leeching 10^21 of that energy for human needs in a hundred years - which isn't really much in global terms. Mankind might need to move towards a level 2 civilization earlier than some people imagine. That or we figure out large scale fusion energy.