No Eden in the New World

Article Abstract:

New evidence suggests that Mesoamerican agricultural practices before the Spanish conquest in the 16th century were not environmentally harmless as has been widely assumed. Sarah L. O'Hara and coworkers deduced rates of erosion due to agriculture from 21 cores taken the bottom of Lake Patzcuaro in Mexico. The resulting data show that prehispanic agriculture caused as much damage in the form of erosion as did pre-industrial land use under Spanish rule.

History, Agricultural ecology, Mexican native peoples, Native Americans (Mexico)

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The rise and growth of Tibet

Article Abstract:

The key to unraveling the uplifting history of the central Tibetan plateau is found in lake sediments on the plateau, some of which formed as long ago as 40 million years. The evolution of mountain topography reflects the balance between tectonic forces in Earth's crust and upper mantle, and climatically driven erosion of Earth's surface.

China, Science & research, Tibet, Tibetan Plateau

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Orbit-related long-term climate cycles revealed in a 12-Myr continental record from Lake Baikal

Article Abstract:

Research is presented concerning the climatic cycles occurring over the past 12-million-years which have been revealed through the study of sediment cores from Lade Baikal. The cooling of the Asian continent is discussed.

Asia, Climatic changes, Climate change, Letter to the Editor, Lake Baikal

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