Nuclear power generates 20 percent of electricity in the U.S., but the nation's reactors are aging — and new plants are expensive and take years to build. Gas, coal, wind and solar are potential alternatives, but all have environmental or logistical drawbacks.
The New Year inspires many people to start fresh. Some vow to exercise more or quit smoking, others clean house or meditate. And we do it again and again, year after year. Astrophysicist Adam Frank explains the role that cycles — natural and arbitrary — play in our lives, and how technology has altered those cycles over time.
A European court ruled Wednesday that airlines flying into and out of European airports will have to pay a price for the carbon dioxide they emit when they burn jet fuel. U.S. carriers had been fighting the plan in court, arguing they've already done their part by becoming more fuel-efficient.
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