A secret hidden in centuries-old mud reveals a new way to save polluted rivers

Israel has grappled with crippling drought for years. But people have learned to use Mediterranean sea water and recycled wastewater to provide the country with enough water for all its needs.

After the drought hit Australia in the early 2000s, city officials had to start thinking seriously about ways to conserve and creatively store their water. External tanks became the solution, storing rain runoff to create an available source of water for Melbourne residents. This solution may not fit every location, but there are other teachable lessons such as taking radically shorter showers.

Laws in Texas and New Mexico, both locked in the grip of a crippling drought, don't do much to actually encourage citizens to conserve water. New conservation laws and financial incentives are trying to change that.

Geography and climate change challenge the viability of sea-level cities in Vietnam, but architects, researchers, and urban planners work together to find creative solutions. One architect in Ho Chi Minh City designed green roofs to absorb the rainwater that causes floods.

For the past three years, water levels in the San Antonio Edwards Aquifer have decreased to uncomfortable levels and drought periods may continue as the population booms. The San Antonio Water System organization has set up rules to limit water use and has recycled water for conservation frugal innovation.

In just the next couple of decades, the World Bank says, farmers across Africa could lose more than half their cropland to drought and heat - the issue is considered so pressing that, a few years ago, Malawi's Department of Meteorological Services added "Climate Change" to its name. A new aid group group now works with farmers in more than 60 villages — with plans to expand — helping them become more resilient to a changing climate.

New water management technology implemented along the Columbia has significantly helped the fish population - specifically salmon - return to healthy numbers and has restored much of the community and industry that revolves around the river, including for native peoples.

Farmers in California increasingly face water shortages. To help solve the problem, some are looking to Australia, where a national water market has provided an economic solution. By buying and selling water rights, farmers have incentives to reduce consumption.

Clean water and healthy ecosystems are becoming increasingly difficult to come by. With floating islands and other inventions, eco-entrepreneur Bruce Kania thinks that biomimicry - such as reconstructing wetlands and growing biofilms - can tackle the toughest of water problems.

The U.S. government has developed different sensors for irrigation devices that gauge water demand and help conserve use. as water shortages caused by drought have increased across the globe, and farmers are faced with economic burdens, such technology is focusin on sustainability for the future.