Final answer:
The burning of coal is the energy source most linked to global warming due to the high levels of carbon dioxide emitted. Coal combustion contributes significantly to the greenhouse effect.
Explanation:
The burning of coal is most linked to global warming due to the release of high levels of carbon dioxide (CO2) into the atmosphere when coal is burned for energy production. Coal combustion is a major contributor to the greenhouse effect, trapping heat in the Earth's atmosphere and leading to global warming.
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