Then they filtered human-caused climate trends from the climate data and reran the bucket simulations. Today’s drought is also afflicting a wider area than the preceding ones: this is a fingerprint of global warming, the researchers say. If La Niña happens every few years, how could it explain a megadrought every few centuries, let alone one lasting almost 100 years? “So you can have decades or centuries with an anomalously high frequency of La Niña years. Fluctuations if one thing but global warming clearly makes the situation worse.

Source: The North Africa Journal April 16, 2020 16:02 UTC