Climate-related risks to health, livelihoods, food security, water supply, human security and economic growth are projected to increase with global warming.

Working at Cross Purposes


The Anchorage Daily News, without any sense of irony, ran two stories in its October 8 edition that are a fine demonstration of Alaska working at cross-purposes to itself. First there was the Washington Post story on the recalculation of the rate of climate change. The report makes clear that the truly catastrophic changes from man-caused climate…

Relative frequency of once-in-five-year precipitation events falling over a 2-day period, averaged over the continental U.S, 1901-2012. Green bars in recent decades show these events have become more frequent, when averaged across much of the country. SOURCE National Climate Assessment (U.S. Global Change Research Program, 2014)

The Thing about 100-Year Floods


A 100-Year Flood, of course, is an extreme flooding event that happens, on average, only once every 100 years. A hydrologist would describe it as a “recurrence interval” or talk about an “annual exceedance probability (AEP).” The recurrence interval can change. If the stream basin is altered, say by urbanization or wildfire, then less rain…

Thermokarst Pond. UAF photo courtesy of Katey Walter Anthony Found in the Arctic and cold mountain regions,

More Bad News on Climate Change


While much of climate science is pretty firmly established, whatever Donald Trump may think, climatologists are still puzzling out some of the details. And some of those details are turning out to be very important. Feedback is one such critical detail. Feedback occurs when outputs of a system are routed back as inputs as part of…