One Green Planet: The Standing Rock Sioux Reservation encompasses 2.3 million acres of land in North Dakota and is home to more than 8,000 members of the Sioux tribe. For the past several months, the people of the reservation have been fighting to protect their sacred lands and precious water supply from potential destruction in the form of the Dakota Access oil pipeline. Water is life, according to the Sioux. In a land where surface water and shallow groundwater are scarce and unreliable sources of water, the...