Our energy needs are ever increasing as our population grows.
It depends on what "we" means - the energy use per capita in the developed world has been surprisingly level in the recent past (even if it is the highest in the world). The population continues to increase, and developing countries get more developed, sure, but once you reach a certain amount of development, it seems the per-person energy requirements start flattening. Of course, the population can't continue to grow without bound, but that's true for lots of reasons. And again, fortunately, developed countries tend to be approaching equilibrium (negative, even, in some parts of Europe).
And it's simply mathematically false that there isn't enough real estate for solar (wind is another matter - but it's power all comes from the sun, anyway). Lets do some order-of-magnitude calculations. The US has been at ~350 GJ/yr per capita for the last few decades. 350 GJ/yr corresponds to ~11 kWs of continuous power usage. The solar constant at the surface of the earth is ~1 kW per square meter. The Earth has a total cross-section of ~10 trillion square meters. So if we give everyone (world population ~ 10 billion) their own US-level standard of living entirely from (perfectly efficient) solar power, it only takes a thousandth of the earth's cross section (or about 1/4000 of it's surface area, if we build the patch on the equator). If we assume current solar efficiencies of ~10%, maybe that means we need 1/100th of the Earth's cross section.
That leaves 99% of the Earth's population free to live on. There's plenty of room for solar to be a permanent solution.