Tag: David Johnston

  • Nation & World

    A read on seawater sulfate

    A tool developed by Professor David Johnston and colleagues might help shed light on biogeochemical cycling in oxygen minimum zones.

    3 minutes
  • Nation & World

    Rock sleuths

    In one of the largest studies of its kind, Harvard researchers have found that carbon records from the mid-Neoproterozoic era can be “read” as a faithful snapshot of the surface carbon cycle between 717 million and 635 million years ago, a finding that directly challenges a decades-long belief of most scientists.

    4 minutes