As a result, certain plants in warm climates have evolved a different mechanism, called C4 photosynthesis, in which other enzymes help to concentrate CO2 around the rubisco, and the initial result is a four-carbon sugar.

ECONOMIST: Genetic modification

Yeast is then added, converting sugar into alcohol and carbon dioxide gas.

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But corn kernels are a cheap and eco-friendly source of sugar--which is also a source of carbon.

FORBES: Shucking Petroleum

An explosives expert told CNN the yellowness of the flame probably came from carbon or some organic fuel such as sugar that contains it.

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Jack Bradley Cave has only 15 milligrams of carbon per liter of water in the rock, the equivalent of 15 grains of sugar dissolved in a liter of water.

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