I don't think technology is necessarily our salvation, as we can see right now it's equally as good to bring about a technocrat dystopia, but it can be used for good purpose, and besides our bombs and lead in gas, we have frequently used it well.

Now, here are a couple numbers considering our potential:

World power generation: 3.2 TW
Total power of the Sun: 410,000,000,000,000 TW

The first number is the amount of energy we are using. The second number is the amount of energy we could be using, if we build a Dyson sphere around the Sun.

That's how far along we are before we enter a true Malthusian state. Until we build a Dyson sphere, and we're consuming all of our Sun's energy, we can grow as long as we develop the technology faster than we reproduce.

(In case anyone questions, "yes but soil" – we can create matter out of energy. Granted, the exchange rate is very high.)