Passage Summary: People think moving to other planets will solve overpopulation, but if we keep having kids at the current rate, we'll fill the Earth back up in just a few decades.

Conclusion: Space colonization would provide only a temporary fix for the problem of Earth's overpopulation.

Reasoning: If the population doubles every 30 years, sending half the people away only resets the clock by 30 years before the Earth is just as crowded as before.

Analysis: This is a classic 'Identify the Conclusion' task where the author introduces a counter-argument and then refutes it. The word 'however' acts as a pivot, signaling that the author's main point is about to be revealed. I identified the conclusion by looking for the claim that the rest of the passage's math is intended to prove. The final sentence provides the specific evidence to support the claim that colonization is merely a temporary solution.