mvscal wrote:Thanks. I stand corrected. It is roughly 1,400 megawatts per sq. kilometer per second, which as you point out is redundant but does make for a somewhat less abstract number and helps underscore the fact that we are talking about "a shitload" of energy. Happy now?Mikey wrote:Watts is a unit of power or energy per unit time. If you want an amount of energy you're talking watt-hours. That's why you can't have a watt per hour or a megawatt per minute.
In any event, my point stands. The human contribution to the total energy in the Earth's system is barely even measurable let alone significant in any way, shape or form.
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You still don't get it. What's your source for this information, because they must not get it either.
There is no such thing as a megawatt per anything per second. What part of the difference between "rate" and "quantity" is not sinking into your thick skull?
The rate of insolation in outer space at 1 AU (the distance from Earth to the sun) is about 1350 Watts per square meter. Now, this comes from Wikipedia, which doesn't necessarily mean it's correct, but at least they are using consistent units.
Now, assuming that the value is correct this would be equivalent to 1.35 kW per square meter. 1 sq km = 1,000,000 sq meter, so this would be 1,350 MW per square km, close to your value, but there is no "per second" or "per minute" possible here.
Now, even if all of that energy reached the earth's surface it would only be at that rate at the very point of the globe that is directly facing the sun, and would decrease depending on the angle of the surface to the sun at any point. Long-term time averaged insolation in sunny areas is about 250 Watts per square meter, or 250 MW per square km.