An abundance of food at reasonable prices is something most Americans take for granted.

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But in a culture with an abundance of food, that formerly life-saving advantage can turn into a distinct disadvantage.

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Just as the abundance of junk food means that people have to be more disciplined about their eating habits, so the abundance of junk information means they have to be more disciplined about their browsing habits.

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But this time it's an abundance of bad food.

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What is more, the extent of sea ice cover influences the abundance of krill and the fish species that eat them - both food sources for the penguins.

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Some of the data it gathered about the abundance of phytoplankton - plant-like organisms that convert carbon dioxide into oxygen and provide food for other sea life - could already be monitored by satellite.

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