Solar power, composting and recycling, buying organic produce, biking to work. You’ve likely seen “sustainable” options everywhere. From how we eat to how we sleep to how we commute, it sounds like “sustainable” is the latest craze taking over. But it’s more than just a trend. And its increasing presence in our products, our conversations and our lives marks an important shift. So what does it mean to be sustainable? And why should we even care?