In recent years, wood burning has gained popularity as a carbon neutral alternative to fossil fuels. But new research from Duke University suggests it's not as green as it seems.
Asma Khalid: We all know trees absorb carbon dioxide. So, the thought is that when you burn wood, you're transferring already-existing carbon from trees into the air. And that carbon is ingested by new trees. True. But, that takes a really long time. Plus, burning wood releases less energy, so you need to burn more of it. Steve Mitchell is the lead scientist on the study.