Kristina Smithe was running the California International Marathon in 2019, grabbing cups of water to stay hydrated, when she started to think about how much waste such events produce. On the flight home, she did the math: 9,000 runners, 17 aid stations and something like 150,000 cups used once and thrown away.
“I was just shocked that, even in California, it’s not sustainable,” Smithe said.
