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“Thresholds matter when it comes to climate change. A small increase in temperature can have a huge impact on natural systems and human infrastructure designed to cope with current weather patterns and extremes. Only a few inches of extra rain can top a levee protecting against flood. Only a degree of warming can be the difference between ice-up and navigable water, between snow pack and bare ground.”

“Climate change has intensified the California drought by fueling record-breaking temperatures that evaporate critically important snowpack, convert snowfall into rain, and dry out soils. This last winter in California was the warmest in 119 years of record keeping, smashing the prior record by an unprecedented margin. Weather records tend to be broken when a temporary trend driven by natural variability runs in the same direction as the long-term trend driven by climate change, in this case towards warmer temperatures. Drought in California has…