Sam Castañeda Holdren is a Master of Sustainability Leadership student from the U.S. who's now living in Colombia, where he founded Out in Colombia, a travel agency focused on sustainable LGBT tourism. Arizona State University's Innovation Happens podcast featured Holdren as its guest on Episode 20. In the podcast, Holdren talks about how he started Out in Colombia and continues to grow his business using what he has learned from his online sustainability degree. Holdren says that Out in Colombia promotes sustainable travel by ensuring that its activities have positive environmental, economic and social impacts. According to Holdren, one thing the company does is "look at where the money is going — is the money staying in the local community?" He further explains that sustainability efforts can be simple and economically beneficial for businesses, and can make a positive difference to community members — not just the environment.