Flygskam is Swedish for "flight shame." Put another way, it's the feeling of guilt based on air travel's carbon footprint. Joep VanDijk had misgivings about air travel, so when he accepted a job as a climate scientist at CU Boulder, he decided against flying to Colorado. His trip from Holland took nearly three months. Meanwhile, Dan Rutherford just returned from a Hawaiian vacation and yes, he flew. It's a decision he wrestles with, personally and professionally, as a program director with the International Council on Clean Transportation. We speak with both men about the increasing awareness about this issue.