If we commit to it, America's electrical grid will be free of fossil fuels by the year 2030.
Colorado is split. Some want to ban fracking, some want to frack more.
Trevor Thomas went blind at age 36. He responded by hiking 18,000 miles. We trekked with him on North Carolina's Mountains-to-Sea Trail.
A team of black climbers blazes a new kind of trail on Mt. Denali