Increased heat from the runaway greenhouse effect evaporates oceans, producing more greenhouse heating. This happened to _____ and might happen to _____ someday.

Question

BlackTom AI · Accepted Answer

The question describes a scenario where an intensified greenhouse effect leads to ocean evaporation, causing further heating, and asks which planets this has happened to and could happen to in the future.
Option 1: "Venus; Mars". The first part is plausible because Venus is the classic example of a runaway greenhouse effect in which oceans have not existed for a long time. However, the second part asserting Mars could someday undergo a runaway greenhouse is implausible given Mars’s thin atmosphere, low greenhouse warming potential, and lack of vast surface water reservoirs to evaporate; thus this pairing is incorrect.
Option 2: "Mars; Mercury". Mars never underwent a runaway greenhouse; it is cold with a thin atmosphere, not a runaway-outcome world. Mercury also would not be expected to develop a runaway greenhouse in the future due to its proximity to the Sun but almost no atmosphere and no oceans to evaporate. This makes the option incorrect.
Option 3: "Venus; the Earth". This matches the known history where Venus experienced a runaway greenhouse, and Earth faces concerns that a sufficiently strong, long-term greenhouse effect could potentially push it toward similar, though not identical, runaway outcomes in the distant future. This aligns with the described mechanism and risk, making this a correct pairing.
Option 4: "the Earth; Venus". Reversing the order implies Earth already did a runaway greenhouse and Venus might do so in the future, which contradicts current scientific understanding: Venus has the runaway history, Earth has not, so this option is incorrect.
Option 5: "the Earth; Mars". This suggests Earth already did a runaway greenhouse and Mars could later, which again contradicts known history and planetary conditions; Mars’s environment does not support a runaway greenhouse scenario. This is incorrect.
In summary, only Option 3 correctly pairs Venus as the planet that experienced a runaway greenhouse and Earth as the planet that could face a similar future risk, while all other options misstate the historical or prospective contexts or mix up the planetary cases.

Increased heat from the runaway greenhouse effect evaporates oceans, producing more greenhouse heating. This happened to _ and might happen to _ someday.单项选择题

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Increased heat from the runaway greenhouse effect evaporates oceans, producing more greenhouse heating. This happened to _____ and might happen to _____ someday.单项选择题