Holiday season is online shopping season. And with online sales expected to surpass $100 billion this year, that equates to a lot of fast and free shipping. But there is a hidden cost to all this shipping: its carbon footprint. In the newest installment of the Climate Lab video series — produced by the University of California in partnership with Vox Media — Conservation International CEO M. Sanjayan takes you inside the world of online shipping and its impacts on the planet.