Crackling fires have long been a gathering place where idyllic chestnuts are roasted, stories shared and souls warmed, whether around a hearth or at a campsite. Some folks cut their own wood and let it season, but most buy their wood without much thought about where it came from.

As it happens, where our firewood comes from matters a lot.

The U.S. National Parks Service recommends getting firewood within 10 (and never more than 50) miles of its destination. Transporting it longer distances — from your home to a campsite or from a farm to your home, for instance — significantly increases the chances of introducing invasive pests into the local ecosystem. And those pests can inflict devastating damage on local forests.

In my suburban New York region, for instance, pests like the Asian long-horned beetle, emerald ash borer, spotted lanternfly and the oak wilt fungal disease are major concerns. Moving untreated firewood from my town to yours could make our problem your problem.

To help prevent this, many states have passed laws against moving untreated wood more than 50 miles from where it was cut or across state lines, unless the package bears a state or federal stamp or seal certifying that it’s been heat-treated to kill pests.

Even seasoned wood can harbor pests, which often hide in layers beneath the bark, where they’re hard to spot. While these pests can’t travel far on their own, giving them a lift on firewood can enable them to start a new infestation in a faraway place.

This isn’t speculation. Past invaders have already decimated native species like the American chestnut, hemlock and American elm.

What’s more, buying local firewood can help protect your garden, too — and your wallet. Infested or diseased trees can have a negative effect on property values. They’re also costly to remove. Plus, no one wants to see the landscape they’ve worked so hard to create fall victim to hitchhiking pests.

The Don’t Move Firewood campaign, an outreach partnership managed by The Nature Conservancy, aims to protect North American trees and forests from invasive insects and diseases that can travel with firewood. You can do your part simply by making informed choices.