Greenhouse Gases Seen Falling in 2015 in Boost for Climate Talks

  • First pollution drop during period of strong economic growth
  • CO2 output must peak by 2020 for best chance to limit warming

A Brief History of Global Warming

Greenhouse-gas pollution probably fell this year after slowing in 2014, the first decline during a period of strong economic growth and a boost for the effort by the United Nations to rein in climate change.

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