Video | Planting Trees vs Protecting Old Forests: Which Stores More Carbon Right Now?

"For decades we’ve been planting trees in hopes of reducing carbon pollution. But when it comes to carbon sequestration, have we actually been getting it all backward?"

To more effectively fight climate change, climate scientist Dr Beverly Law recommends protecting the old-growth forests of the Pacific Northwest, up through Southeast Alaska and Tongass National Forest.

“Let them grow. Set them aside as carbon reserves. I call it strategic carbon reserves,” she explains. Why?

Law put carbon monitoring stations in a mature forest and a young forest to compare them. From the measurements, she discovered that young forests aren’t taking up as much carbon as mature forests. In fact, young forests are emitting more carbon than they can absorb. Maiya May, host of PBS Terra’s Weathered series, explains:

“There’s nothing wrong with young forests. Eventually, after 10 to 20 years, newly planted forests will become carbon sinks. But the problem is we don’t have 20 years to address climate change. Planting trees now might help in the long run, but those old forests are really the key to storing carbon before we hit tipping points for climate change.”

And from Law’s article in The Conversation:

“Forests pull about one-third of all human-caused carbon dioxide emissions from the atmosphere each year. Researchers have calculated that ending deforestation and allowing mature forests to keep growing could enable forests to take up twice as much carbon.”