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In view of their probable contribution to past oil deposits, much attention is currently focused on their potential as a source of biofuel.Please visit http://extras.springer.com/ to view Extra Materials belonging to this volume.This book complements the highly successful Ecology of Cyanobacteria and integrates the discoveries of the past twelve years with the older literature.  Free Download Ecology and Man in Mexico's Central Volcanoes Area By Roland Bobbink, Gerrit W. Heil (auth.), Gerrit W. Heil, Roland Bobbink, Nuri Trigo Boix (eds.) 2003 | 222 Pages | ISBN: 9401037566 | PDF | 6 MB The main activities of the economically active population around The Iztaccíhuatl and Popocatépetl volcanoes region lie in the primary sector (65- 90%). Of the people working in this sector, those dependent on agricultural or pastoral activities generally have an income significantly lower than the minimum wage in Mexico. 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