You come to an intersection — a red light means stop and a green light means go. Yellow, well, there are different schools of thought, but the other two are always the same. Around here, we have three “trash” bins — one for actual garbage, one for recyclables, and one for compostables. They’re always black, blue, and green, respectively. There’s never any doubt — food scraps go in the green bin, bottles and cans in the blue one. Doesn’t matter whose house you’re at, you know where to scrape your plate. Unfortunately, not every industry is so considerate.