Ecologist Jon Foley says agriculture is the "most powerful force unleashed on this planet since the end of the ice age." He says we're using too much to irrigate and we have to rethink how we farm.
NPR's Robert Siegel speaks with U.S. Energy Secretary Ernest Moniz about the Iran nuclear deal. Secretary Moniz was an important player in the negotiations.
NPR's Robert Siegel speaks with Republican Sen. Lindsey Graham about the Iran nuclear agreement. He says a deal should have been contingent on Iran changing its behavior toward its neighbors.
President Obama made his case for the Iran nuclear deal at a press conference Wednesday. He said the agreement achieves its primary goal, which is to prevent Iran from developing a nuclear weapon.
NPR's Audie Cornish speaks with veteran former International Atomic Energy Agency inspector Thomas Shea about the Iran nuclear deal and how the process of inspections may change.
Battery problems on the Solar Impulse, the airplane that has been flying around the world using only the sun's power, have grounded it until next spring.
Iran holds the fourth-largest oil reserves in the world, and the nuclear deal could mean millions oil barrels flowing into an already saturated market, pushing the global price down further.
The International Energy Agency, in its latest forecast, says demand will continue to slow well into next year, but that a "rebalance" of the market will eventually stabilize prices.