We are doing both. We are doing more insulating than heating, but we obviously generate more heat.
If so, how'd you do on the numbers?
Is it x10, x100, x1000, .. more?
This is after all the part that matters.
The original question is a good one. We will use more energy as it gets cheaper (see monster trucks, Las Vegas, Dubai). We should be thinking of what we will do with the waste heat when everyone has a fusion reactor.
To be clear I made a qualified assertion; the phrase "Relative scales of various factors matter here" does the work.
> Obviously we get more heat from the sun than we generate on our own.
Yes - but, again, How much more?
If it's barely twice as much (which seems unlikely) then heat from our activity is a major factor in all this.
If it's 100,000x times more then I stand firm, heat from our activity has effectively zero impact on the AGW issue (although other by-products from our daily routines are the crux of the problem).
If it's some other factor then what relative signifigance does our human heat generation have?
> I have no idea.
It's a shame you didn't grab an envelope and make use of the back, it's a classic Fermi problem [1] of the kind I and my class mates were posed in high school and the kind of thing many other HN commeters would delight in taking a run at.
If you're feeling game you might like to start with the daily heating of the earths surface from the sun, and then look at the petajoules of energy generated and consumed per day and take a stab at guesstimating the waste (unused, released into the lower earths surface layer) heat as a percentage (or google efficiencies, etc).
Have fun!
We aren't "heating up the planet" .. we're "insulating the atmosphere".
Increased C02 (and the close following methane and water vapor increases) serve to trap more of the heat radiated outwards that would otherwise escape.
The vast bulk of that heat comes from the visible light of the sun which passes easily through the atmosphere coming in, gets converted to IR energy as it warms the earth and oceans, and then escapes outwards.
Our changes to the atmosphere have disturbed that balance.
Your comment has some small merit, but you would need to work through the heat output of human generated power and then compare that to the daily heat energy originally from the sun that radiates outward.