Large corporations with hefty fossil fuel emissions are often criticized for exacerbating climate change. But now, many businesses are joining the climate movement themselves by prioritizing environmental sustainability. Why the businesses are motivated to do so — and if their actions will be enough — is up for debate.

I walk to school every day. I used to listen to music but now I listen to podcasts. I listen to NPR’s “Fresh Air,” “Up First” and “Embedded,” The New York Times’ “The Daily” and “The...