It takes an enormous amount of energy to design, assemble and ship hundreds of millions of products all over the world. That energy makes up our carbon footprint and, in turn, our share of the climate change problem. We’ve made real progress in reducing the impact of the things we control directly — our offices, retail stores and products. But there’s still a lot of work to be done to reduce the carbon footprint of our supply chain. And it’s our responsibility to lead that effort.