[paulmd]

Absolutely yes, at a sufficiently big-picture view the eventual problem is energy expenditure itself. Capturing more energy from the sun, or more realistically something like large-scale fission/fusion utilization still results in an increased amount of energy being deposited into the earth's atmosphere even aside from the greenhouse effect.

I am obviously not an expert but I looked at the magnitude of the energy itself vs the greenhouse effect and it's about 10-100x less potent than the greenhouse effect. But that means that even if we had 100% clean carbon-free energy, we can't continue increasing our energy utilization forever. And we still have a huge portion of the world that is below a first-world living standard and will eventually want automobiles and air conditioning and vacations using jet travel too.

IF we do not level off the energy consumption of the "first world" standard of living sometime within the next 50-100 years then we are on a course to cook ourselves to death even with 100% clean energy.

[skyzadev]

What I am really getting out all of this is that at some point we will hit the human population limit that earth can sustain, even with renewable energy sources.

Whether or not that limit is actually reachable and something we should actually worry about I don't know. i.e: is there enough physical space for that many people on earth where each person uses X amount of renewable energy where the sum of X is greater than the amount of energy the earth can actually capture without being negatively affected.