> harvest its energy output
At most pi r_earth^2 / (4 pi d_earth_sun^2) = 1/2billion of its energy output. Unless we build a Dyson sphere or something.
At most pi r_earth^2 / (4 pi d_earth_sun^2) = 1/2billion of its energy output. Unless we build a Dyson sphere or something.
If you need more, sure, go for nuclear fusion.
Until then, just remember slow and steady usually wins the race.