Last summer, I stood on a cliff 100 feet above the Madre De Dios River, in Southern Peru near the Bolivian border, to watch the rosy gift of an Amazon sunset. It was quiet, in a tropical rainforest way, with the light clamor of parrots, macaws, and cicadas. Then, a peke-peke motorized canoe broke through the soft din. It arrived from the east, carrying a new supply of diesel fuel for the gold miners who were prepping the generator that would operate a suction-pump and dredge for gold across the river and around the bend. Before nightfall, the fuel ignited the baritone of a diesel generator. It moaned all night and all day, barely stopping. In subsequent days, instead of a light clamor of birds and primates, the thrum of a gold mining operation seemed like all I could hear.

For some time, it has been clear that a global population imbalance is emerging. High income countries, including nearly all of the Americas, Europe, and most of East and parts of South and Southeast Asia, have seen a dramatic, sustained fall in fertility. Already, this is resulting in shrinking labor forces and the oldest mean age populations seen in history. At the same time, the low income countries and even some lower middle-income countries—mainly in Africa but also in Central America, the Middle East, and parts of South and Southeast Asia—continue to have relatively high fertility. This is now, and even more in the coming decades, producing fast-growing labor forces and relatively young populations.

In the years ahead, climate change and the proliferation of new technologies and information availability will require us to reshape our vision of shared waters. Because these megatrends are experienced in concert, the opportunities, challenges, and uncertainties for shared water management will continue to compound over time.

While it is impossible to know precisely how shared water will look in the future, we should already be working to expand how we conceptualize shared waters, address inequities embedded within water management, and develop criteria and processes that successfully identify and include non-traditional shared water actors in decision-making. These shifts will strengthen our ability to generate creative and sustainable management strategies and help us avoid water-related conflicts.

Evidence of the effects of climate change continues to mount. We see it in extreme weather events, including droughts and intense hurricanes and cyclones, in biodiversity loss, and in erratic weather patterns around the globe. While many of these impacts rightfully make it into front-page news, climate change is also profoundly affecting parts of our planet that we do not understand well—the ocean and the cryosphere.

In September 2019, the International Panel on Climate Change issued a Special Report on the Ocean and Cryosphere in a Changing Climate (SROCC). The report provides a new and sobering analysis of current conditions, as well as projections into the future. Produced by more than 100 authors from 36 countries, the SROCC painstakingly reviews the latest scientific literature, referencing some 7,000 scientific publications in all.

As disasters have changed over the years, so must the personnel who manage these crises.

In 1932, sociologist Lowell Carr first described a predictable pattern of how disasters impact society. Refined over the decades by many researchers, the “disaster cycle” includes four phases: prevention, preparedness, response, recovery and rehabilitation.

This disaster cycle helped define the way societies respond to each disaster. Today, highly trained emergency personnel using many research, management, and epidemiological skills have helped improve survival and health outcomes after disasters. “Disaster medicine” now defines a sub-specialty for highly skilled professional health specialists. However, their many activities and skill sets primarily focus on only the response phase of the initial disaster cycle.