The association for British waste-management companies has some concerns about Brexit. Its members send some 3 million metric tons of refuse every year to European facilities for treatment, and with the pound’s slide since last year’s referendum, their euro-denominated contracts are getting more expensive.

That’s not the only concern that Jacob Hayler, executive director of the Environmental Services Association, laid out to a group of Harvard researchers looking into the effects of Brexit on small- and medium-sized UK firms. There’s also a concern about whether future UK policy will align with current EU targets for recycling and municipal waste.