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Volume 11 Issue 5, May 2018

Tree cover promoted in semi-arid Sahelian farms

Farmland management promotes tree cover around villages in the semi-arid Sahel of West Africa, according to analyses of satellite imagery. This implies that a higher population density does not always lead to reduced tree cover. The image shows tree cover around settlements in the African Sahel.

See Brandt et al and N&Vs by Hanan

Image: Martin Brandt, University of Copenhagen. Cover Design: Lauren Heslop.

Editorial

  • Human manipulation of hydrocarbons — as fuel and raw materials for modern society — has changed our world and the indelible imprint we will leave in the rock record. Plastics alone have permeated our lives and every corner of our planet.

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Comment

  • Ethnic and racial diversity are extremely low among United States citizens and permanent residents who earned doctorates in earth, atmospheric and ocean sciences. Worse, there has been little to no improvement over the past four decades.

    • Rachel E. Bernard
    • Emily H. G. Cooperdock
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News & Views

  • West African farmers adjust tree cover to realize the co-benefits of agroforestry, according to analyses of remote sensing data.

    • Niall P. Hanan
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  • A regional oxygenation event 1.6 billion years ago coincided with the appearance of large fossils, but whether the availability of oxygen was the primary driver of the diversification of multicellular organisms remains to be seen.

    • Emma U. Hammarlund
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  • Enhanced upwelling and CO2 degassing from the subpolar North Pacific during a warm event 14,000 years ago may have helped keep atmospheric CO2 levels high enough to propel the Earth out of the last ice age.

    • Samuel L. Jaccard
    • Eric D. Galbraith
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  • Geoscientists are training computers to learn from a wide range of geologic data and, in the process, the machines are teaching geoscientists about the workings of Earth.

    • Chris Marone
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Review Articles

  • The Cassini mission revealed the complex workings of Titan’s methane-based hydrologic cycle over a range of timescales, providing a potential window into the future of Earth and its water cycle.

    • Alexander G. Hayes
    • Ralph D. Lorenz
    • Jonathan I. Lunine
    Review Article
  • Indicators of environmental and social footprints of international trade must inform assessments of progress towards the UN Sustainable Development Goals, suggests a synthesis of studies on the geospatial separation of consumption and production.

    • Thomas Wiedmann
    • Manfred Lenzen
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