Water, water everywhere but not a drop to drink: All five of the most popular posts last month focused on water scarcity.

The final two parts of our “Choke Point: Tamil Nadu” series, which explores the conflicting demands for water, food, and energy in the South Indian state, took the top spots. In June’s most popular post, Circle of Blue’s Keith Schneider reports on Tamil Nadu’s leadership in India’s transition to solar and wind energy, which use far less of the country’s scarce water resources than coal and nuclear power plants. Schneider also wrote “New Media Helps Galvanize Tamil Nadu to Fight a Toxic Legacy,” which describes an environmental activist’s fight against industrial water contamination.

“As new energy options emerge to meet global demand, nations that lead stand to gain; should the U.S. sit on the sidelines, it does so at considerable risk to our national security,” advises the latest report from CNA’s Military Advisory Board (MAB), a group of retired generals and admirals.

U.S. prosperity and national security depend directly on the prosperity and stability of our partner countries and competing countries around the world. Today, water-driven stresses are, with increasing frequency, undermining economic productivity, weakening governance systems, and fraying social cohesion. Water scarcity has created a context of human and societal need wherein water stress has undermined the vitality of rural livelihoods, driven broad migratory movements, become a weapon of war, contributed to the growth of insurgencies and terrorist networks, and given rise to increased demand for U.S. development, humanitarian, and military assistance.

HONOLULU – Sludge. The final, unwanted byproduct of a toilet flush. The semi-solid stuff that even wastewater treatment plants send packing to the landfill. Unseen in the steel pipes snaking high on the exterior of Honolulu’s H-POWER plant, sludge is injected into a massive boiler where it joins the city’s trash in a roaring inferno. From the gravel lot outside, it all seems very antiseptic and smells less than a stroll past the neighborhood dumpster. But the 70-megawatt waste-to-energy facility is a workhorse, processing as much as 2,000 tons of refuse each day from Oahu’s 1 million residents. All told, it generates up to 10 percent of the electricity needed to power this Pacific island.

In 2016, the Environmental Protection Agency charged its federal advisory committee with exploring how citizen science and crowdsourcing should be integrated into the agency’s mission. The resulting report eloquently describes how if the environment is to be protected then it’s the duty of all – the government, institutions, and citizens – to work together to achieve this.

“There’s a lot you can do to mitigate risk once you acknowledge the risk exists,” said John Conger, senior advisor at the Center for Strategic and International Studies at a June 5th briefing on Capitol Hill. Convened by the Environmental and Energy Study Institute, Center for Climate and Security,  and the Henry M. Jackson Foundation, the panel of former Department of Defense (DOD) officials and retired military officers included Sherri Goodman, senior fellow at the Wilson Center, and three members of the Military Advisory Board: Brigadier General Gerald Galloway, General Ron Keys, and Rear Admiral Ann C. Phillips.

In 2012, the U.S. National Intelligence Council judged that within the next 10 years, water problems would be a major contributor to instability in “many” countries that are of interest to the United States. South and Southeast Asia, with its many transboundary river basins, large populations, and geopolitical flashpoints, is one among a number of hotspots where such instability could occur.

In a world rapidly churning out unpredictable political shocks, intelligence analysts occasionally need to clear their heads of the daily barrage of newsworthy events and instead work with simple theories that discern the direction and speed of trends and help predict their outcomes. Political demography, the study of population age structures and their relationships to political trends and events, has helped some analysts predict geopolitical changes in a world that, from time to time, appears utterly chaotic.