3. United States emissions had been declining because of increased burning of natural gas in power generation, which emits less carbon dioxide for each unit of energy than does coal. But the nation reported an increase in 2013 as coal regained some market share. If that trend continues, it could prove to be a challenge for the Obama administration as it seeks to institute tighter policies on greenhouse gases.
4. The US box office, which includes totals from Canada, hit $11.1 billion, an 8 percent increase year-over-year, and was credited to several smash hits, including Jurassic World ($652 million domestically), Avengers: Age of Ultron ($459 million) and Inside Out ($356 million).
5. London, meanwhile, is expected to welcome 18.88 million visitors this year.