Earth and climate – an ongoing controversy
Researchers believe the so-called global warming hiatus ended in 2014 ‘as a new El Niño Southern Oscillation (ENSO) event was developing’. Whether there’s a struggle between natural cooling and non-natural warming is an open question. So-called internal variability can surely vary either up or down, i.e. warmer or cooler, in any time frame.
Global warming has been attributed to persistent increases in atmospheric greenhouse gases (GHGs), especially in CO2, since 1870, the beginning of the Industrial Revolution, say the researchers.
Nevertheless, the upward trend in global mean surface temperature (GMST) slowed or even paused during the first decade of the twenty-first century, even though CO2 levels continued to rise and reached nearly 400 ppm in 2013.
This episode has typically been termed the global warming hiatus or slowdown in warming. The hiatus is characterized as a near-zero trend over a period.
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