Keyword: epoch

Brevity: Headers | « Text »
  • Humans Force Earth into New Geologic Epoch

    01/31/2008 9:37:24 AM PST · by forkinsocket · 65 replies · 130+ views
    Livescience ^ | 27 January 2008 | Robert Roy Britt
    Humans have altered Earth so much that scientists say a new epoch in the planet's geologic history has begun. Say goodbye to the 10,000-year-old Holocene Epoch and hello to the Anthropocene. Among the major changes heralding this two-century-old man-made epoch: Vastly altered sediment erosion and deposition patterns. Major disturbances to the carbon cycle and global temperature. Wholesale changes in biology, from altered flowering times to new migration patterns. Acidification of the ocean, which threatens tiny marine life that forms the bottom of the food chain. The idea, first suggested in 2000 by Nobel Prize-winning chemist Paul Crutzen, has gained steam...
  • Man-Made Changes Bring About New Epoch in Earth's History

    01/26/2008 10:38:21 PM PST · by blam · 66 replies · 137+ views
    Alpha Galileo ^ | 1-26-2008 | University Of Leicester
    Man-Made Changes Bring About New Epoch in Earth's History 25 January 2008 Geologists from the University of Leicester propose that humankind has so altered the Earth that it has brought about an end to one epoch of Earthís history and marked the start of a new epoch. Jan Zalasiewicz and Mark Williams at the University of Leicester and their colleagues on the Stratigraphy Commission of the Geological Society of London have presented their research in the journal GSA Today. In it, they suggest humans have so changed the Earth that on the planet the Holocene epoch has ended and we...
  • What killed the mammoths and other behemoths?

    06/05/2002 3:34:28 PM PDT · by vannrox · 95 replies · 3,710+ views
    FR Post 6-6-2 | Interview with Ross MacPhee
    Interview with Ross MacPhee What killed the mammoths and other behemoths that once roamed the Americas? This mammalogist thinks it may have been hyperlethal disease Image: Clare Flemming Around 11,000 years ago, at the end of the Pleistocene epoch, North America witnessed an extinction that claimed its mammoths, giant ground sloths, camels and numerous other large-bodied animals. Exactly what happened to these megafauna is unknown. Indeed, researchers have puzzled over their disappearance for decades. Traditional explanations hold that either dramatic climate shifts, or human hunting (overkill) extinguished these species. But in recent years a new hypothesis has emerged. According...