Short-term Variations Versus Long-term Trend

Short-term Variations Versus Long-term Trend

Short-term trends in global temperature (blue lines show temperature trends at five-year intervals from 1970 to 2010) can range from decreases to sharp increases. The evidence of climate change is based on long-term trends over 20-30 years or more (red line). (Data from NOAA NCDC).

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Physical Climate, Observations