"A solar-powered plane nearing the close of a cross-continental journey landed at Dulles International Airport outside the nation’s capital early Sunday, only one short leg to New York remaining on a voyage that opened in May."

"There's fresh evidence that the chemical bisphenol A, or BPA, may play a part in childhood obesity."

"Could your driveway be making you sick? Mounting research suggests it could. It's prompting more cities, states and businesses to ban a common pavement sealant linked to higher cancer risks and contaminated soil."

"CROW AGENCY, Mont. — Every few hours trains packed with coal pass through the sagebrush-covered landscape here in southern Montana, some on their way north to Canadian ports for shipment to Japan and South Korea. If the mining company Cloud Peak Energy has its way, many more trains will cross the prairie to far larger proposed export terminals in Washington State."

"When does a nuclear plant become too old? The nuclear industry is wrestling with that question as it tries to determine whether problems at reactors, all designed in the 1960s and 1970s, are middle-aged aches and pains or end-of-life crises."

"Rising seas and increasingly severe weather are expected to increase the areas of the United States at risk of floods by up to 45 percent by 2100, according to a first-of-its-kind report released by the Federal Emergency Management Agency on Wednesday. These changes could double the number of flood-prone properties covered by the National Flood Insurance Program and drastically increase the costs of floods, the report finds."

"Severe weather cost the nation $110 billion in damages in 2012, the second-costliest in history, according to disaster information released Thursday by the National Oceanic and Atmospheric Administration."

"Mayor Michael R. Bloomberg on Thursday proposed major changes to New York City’s building code, saying Hurricane Sandy showed that both commercial and residential properties needed additional safeguards against severe weather."

"The Supreme Court ruled unanimously Thursday that human genes cannot be patented, a decision that is likely to shape the future of medical and biotech research."

"A White House adviser said yesterday that President Obama will soon renew his domestic efforts on climate change, as promised in his second State of the Union address, and follow the strides he made with China last weekend with further international engagement on the issue."