Passage Summary: Warm, deep water makes tropical storms more likely to happen. Because rising CO2 levels are heating up the Earth's oceans, more areas will eventually reach the specific temperature needed for these storms to form.

Reasoning: Tropical storm development is linked to specific water temperature and depth thresholds, and rising atmospheric carbon dioxide is expected to increase the number of water bodies meeting those thresholds.

Analysis: This stimulus provides a series of factual premises that create a causal chain. We know that CO2 leads to warmer water, and we know that warmer water (at a specific depth) leads to a higher chance of tropical storms. Therefore, we are looking for a conclusion that synthesizes these facts, likely suggesting that the frequency or geographical distribution of tropical storms will increase as CO2 levels rise. Avoid any answer choices that make claims about the intensity of the storms or other factors not mentioned, such as wind speed or land damage.