Are regional temperature changes due to human activities?
Global average temperature increases in recent decades are primarily due to increasing greenhouse gas concentrations in the atmosphere resulting from human activities, such as the burning of fossil fuels. Yet, the magnitude of the anthropogenic influence on regional climate remains uncertain. A principal reason is because the effects of human activities are superimposed on the background “noise” of natural climate variability, which can be very large regionally. Global warming does not mean that temperature increases are spatially uniform or monotonic: some places warm more than the average and some places cool. Regional changes in temperature are often associated with changes natural patterns (or modes) of the atmospheric and oceanic circulation, such as the El Niño/Southern Oscillation (ENSO) phenomenon. Changes in the climate system from human activities may affect these modes, however, so quantifying the anthropogenic and natural components of the observed warming on regional scale
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