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"We've had time to act — and essentially we haven't acted," says science journalist Michael Lemonick. He describes the threats posed by climate change in his new book, Global Weirdness: Severe Storms, Deadly Heat Waves, Relentless Drought, Rising Seas, and the Weather of the Future.

The murders of six people at the Sikh temple in Oak Creek, Wis., by a gunman with ties to white supremacists has raised questions about the prevalence and influence of hate groups in America — who they are, what they do, and how they recruit new members.

After months of sitting on their wallets, Americans went shopping in July. The uptick is boosting economists' hopes for a reasonably strong back-to-school season, but shoppers seem to be spending carefully. Retailers are looking for clues about how the holiday shopping season will turn out later in the year.

GOP presidential candidate Mitt Romney campaigned in Ohio on Tuesday, where his focus was on coal and energy policy.

Vice President Joe Biden hit the campaign trail on Tuesday to go after the man who wants to take his job, Paul Ryan. Larry Abramson was traveling with Biden and shares the latest with Audie Cornish.

A study found that a third of the residents of Minamisoma had detectable levels of radiation. But another study said plant workers are at risk of psychological distress.

The Arizona city already logs more days over 100 degrees than any U.S. city, and climate researchers predict Phoenix will grow hotter still in the coming decades. Planners are taking the projections seriously, and are looking for ways to adapt the city and its residents to a hotter, drier reality.

Mitt Romney's new running mate has authored some provocative policy proposals to cut budget deficits and overhaul Social Security, Medicare and Medicaid. But Rep. Paul Ryan has also been an advocate for a different course for the Federal Reserve.

Hundreds gathered in Flint, Mich., Tuesday, to celebrate the return of Olympian Claressa Shields. Just 17, Shields won America's lone gold medal in boxing at the Summer Games. And her triumph was welcome news in Flint, a struggling town that gave her a motorcycle escort home.

Once relegated to one-time promos and marketing campaigns, Twitter is now a tool businesses use to provide customer service. And for some customers, Twitter can be a deciding factor in what companies they do business with.