On Son Island in Vietnam’s Mekong Delta, Le Trung Tin scatters fish feed into his ponds, where dozens of snakehead fish leap through the surface in synchronised bursts. “I taught them how to do that,” he says proudly, tossing another handful of feed at his fish.

The scene looks idyllic, but Le’s fish farm is a reluctant response to an escalating crisis. For decades, he made his living fishing the Hau River, a distributary of the Mekong. But in recent years, plastic waste clogged his nets and strangled the fish. “I had no choice but to stop,” he says. “Everything was tangled – trash, nets, even the fish themselves. It was hopeless.”

As the 1990s drew to a close, there was a sense that much of the momentum gained at the first Earth Summit on sustainable development, a positive, affirming environmental narrative, was waning.

In 2003, the United Nations General Assembly declared 2005 to 2015 to be the decade of “water for life” as a way to encourage countries to reach their water-related targets under the Millennium Development Goals. In summing up the last 10 years, it was noted that water cooperation had been promoted widely, featuring at international fora and in government initiatives and development agendas. Water cooperation is described as having the potential to enable peace and sustainable development. However, just as focusing on “water wars”  might undermine the everyday challenges of securing safe and adequate supplies of water, focusing only on “more cooperation” may well simplify the problem at hand.

As the earth’s surface grows hotter and precipitation becomes more variable due to the impacts of climate change, the world is in need of solutions to more effectively store water supplies. One potential solution is deceptively simple: store water in aquifers below the ground.

In the sleepy northern Thai border town of Huay Luk, a community leader, Pornsawan Boontun, still remembers the day when villagers netted a Mekong giant catfish more than a decade ago. The fish weighed 615 pounds, and it surprised everyone since the elusive species has never been common in this stretch of river.

A well-known Chinese proverb describing the relationship between the central government in Beijing and its people says, “Heaven is high and the emperor is far away” (天高皇帝远, tian gao, huang di yuan). It’s not too far of a stretch to apply the same proverb to the current state of China’s environment sector, where relatively strong pollution control laws are poorly enforced on the ground.