A fired-up field of Democrats stumbled on some facts at the most visceral turns in their debate Thursday as they took on and sometimes sparred over race, the treatment of migrant children, the climate and the super-rich.
University of Minnesota researchers developed a tractor engine that can run on a mixture of diesel fuel and anhydrous ammonia, a common nitrogen fertilizer.
Cities, states, businesses and electric utilities are setting ambitious goals to cut greenhouse gas emissions. But it's not clear exactly how they'll do that or whether it will actually work.
There was a lot of give-and-take at the last minute between the DFL-controlled House and Republican-controlled Senate. Some provisions -- like establishing grants to get kids outdoors -- made it through, while others -- like lifting the state's ban on new nuclear power plants -- were abandoned.
Minnesota is in the midst of a historic transition in how it generates electricity. Xcel Energy last week announced plans to close all of its remaining coal-fired power plants in the state by 2030 -- and to increase its solar capacity in the Upper Midwest by 1,400 percent.
A United Nations report this week estimates that 1 million species are threatened with extinction. "You destroy nature and it's going to bite you back," says one ecologist.
Anesthesia revolutionized surgery by vanquishing patients' pain. But many of the chemicals are greenhouse gases. One Oregon doctor who has done the math says some are much less damaging to the planet.
"Protecting biodiversity amounts to protecting humanity," says UNESCO Director-General Audrey Azoulay, who warns that species are being lost at an alarming rate.
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