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The Mekong River in Southeast Asia flows for 4,350 kilometers from China to Vietnam through Laos, Myanmar, Thailand and Cambodia. China's construction of large hydropower dams to feed the country's growing energy needs is causing problems downriver, including dire impacts on the waters and fertile soil that feed hundreds of millions of people.

From caring for baby monkeys in Kenya, once mighty lions in Sudan to genetically modified mosquitos and whale researchers in the Mediterranean: On this week's show it's all about creatures great and small.

Researchers find protecting the panda has come at the expense of helping other species thrive in the same habitat. Meanwhile, a peculiar native marsupial in Australia faces extinction, threatened by a unique type of contagious cancer. And: an ambitious rewilding project in The Netherlands that's seen a neglected lake transformed into an archipelago teeming with life.