Which line of scientific evidence most directly supports the conclusion that recent global warming is primarily driven by human emissions of greenhouse gases?

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The observation that volcanic eruptions occasionally cool the climate for a few years by injecting aerosols into the stratosphere.

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The fact that the Sun’s total energy output has increased steadily and significantly during the last five decades, matching the warming trend.

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The observation that natural climate cycles, such as El Niño and La Niña, cause year-to-year variations in global temperature.

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The strong correlation between rising atmospheric carbon dioxide concentrations from fossil fuel burning and the observed increase in global average surface temperature over the past century, supported by climate model simulations.

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Which line of scientific evidence most directly supports the conclusion that rec...

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