We are using the sun's energy that hits the earth. Some as light (which turns into heat), some as electricity (which turns into heat), and some as plant food > animal food > oil (which turns into heat)
A Dyson sphere would capture the sun's energy that leaves the sun, not just the fraction that hits earth. Using that energy on earth would release far more heat than our current activities.
A Dyson sphere would capture the sun's energy that leaves the sun, not just the fraction that hits earth. Using that energy on earth would release far more heat than our current activities.