The Blue Nile Falls / Tis Abay / Tis Issat near Bahar Dar, Ethiopia, East Africa. Arterra / UIG via Getty Images
Australia's Murray Darling basin covers more than a million square kilometers (approximately 386,000 square miles), 14 percent of the country's landmass. It's the site of tens of thousands of wetlands, but increasing demand for water has stretched its resources to the limit.
Many of the basin's wetlands and floodplain forests are declining—several former wetlands and forests have even been consumed by bushfires, which are becoming more frequent every year. Yet when Australian officials sought to introduce strict water allocation rules, they met with fierce resistance from farmers in the region who depend on irrigation for their livelihood.