It’s hard to overstate the impact cars have on childhood. As a parent I’m not worried about some rando snatching my kid, I’m worried about someone hitting them with a car. There are so many places in the US where it is unsafe to walk, and there’s a reason why our traffic deaths are going up while the rest of the world’s are going down.

I’m active in trying to make my city a place where kids can have the freedom to explore and grow, but it definitely feels like a “planting a tree the shade of which you will never know” situation.

So if you take someone in the United States, driving an average of 25,000 km per year, they are generating something like 2,750 g of microplastics. If that same person mountain bikes 25 km per week for a year (1,300 km) they are generating something like 46 g of microplastics. I’m all for making mountain biking more environmentally friendly, but it looks like a rounding error on our microplastic emissions when looking at other sources. Combined with giving people more reason to protect nature, I’d guess it’s a net positive. Here in the US, wet need to fix our land use and transportation, as car dependency is not compatible with a livable planet.