It's January. Time for our annual "Year of Big Ideas." This year, we talked to Alastair Humphreys, a 2012 National Geographic Adventurer of the Year. Among other things, Alastair has walked across India and 1000 miles through the largest sand desert in the world, cycled 46,000 miles around the world and rowed across the Atlantic.People often come up to him after his talks and tell him they wish they could go on the kinds of adventures that he does. Alastair believes that they can. Today, he explains what he's learned about what it takes to make an adventure happen. Here's to another year of big ideas, and committing to them. Happy 2015!