It seems like a strange concept to connect energy utilization to technological advancement. While the technology necessary to capture all solar energy
hitting the Earth would be advanced, the premise is that the civilization would require that energy (why capture it otherwise?). Is that a valid
assumption? Use of energy at that level would seem to imply massive industrial needs. If not industry, what else would the power be used for?
Supporting an enormous population? Maybe, but are these the directions a technologically advanced civilization would necessarily go? The idea seems to
be humancentric. As humans we've shown that we like to multiply like crazy and build complex and energy hungry infrastructure. Perhaps other
civilizations have less expansive and expensive goals and would never have the need for that much energy.
But let's talk about us. We're an ambitious race. Maybe we are going in that direction. But perhaps raw energy use is self limiting. Capturing and
utilizing all of the Sun's energy which strikes the Earth and using it on Earth would wreak havoc with the climate. As it is now, most of the energy,
the vast majority of it, is reflected and radiated back into space. If it is instead captured and used on the surface (doing whatever it is we are
going to do with it), what happens to all that heat?. This has nothing to do with the greenhouse effect, that's small potatoes compared to what
capturing all of the Sun's energy implies. Could a civilization capable of doing that actually survive their own success? It's easy to say that an
advanced civilization could cope with the problem. Much easier to say than to actually deal with the laws of thermodynamics.
Kaku talks about self destruction through violence but he does not address this point. Even if we learn to get along, we can still be the cause of our
own destruction (or retardation).
We are nowhere near being a type I Civ. Not only do we not have the technology to capture the Sun's energy, we have nothing to do with it all. We as
a planet are using, on an annual basis,(with fossil fuels, nuclear power, and miscellaneous other power sources) about 10% of the Sun's power
which strikes the Earth in one day. In other words, we are only using about 2.5/10,000ths of it, and we're trying as hard as we can.
[edit on 10/3/2009 by Phage]




