WATER

Climate Change

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Climate change impacts on hydrology and water resources. Even in the absence of a human-induced climate change, hydrological behaviour will vary not only from year to year but also from decade to decade. They show that natural multi-decadal (30-year) variability in average annual runoff is high across most of Europe and that this natural variability in runoff in mid-latitude Europe is greater than the simulated signal of climate change. In northern and southern Europe, the magnitude of climate change by the 2050s is greater than the magnitude of natural variability. Whereas in other areas, the climate change signal will be larger than past experience.