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Microalgae production for biofuels. Worker with glass jars containing cultures of Chlorella vulgaris microalgae. These cultures will be used to seed ponds where the algae will be grown. This site composts household waste to produce methane, which is burned to produce electricity. The carbon dioxide released from the combustion of the waste is used to help grow microalgae, which are then used for biofuel production. The carbon dioxide is pumped into ponds to promote photosynthesis and therefore growth of the algae. Photographed in France. (KEYSTONE/SCIENCE PHOTO LIBRARY/PASCAL GOETGHELUCK/SCIENCE PHOTO LIBRARY)