Real or fake Christmas tree: What is the greenest option?

From the show

Let’s talk about a topic that is increasingly being debated at the dinner table here in France with Christmas around the corner! What is the greenest option between an artificial tree and a natural fir tree? On the one hand, the artificial tree is reusable every year. On the other hand, natural fir is biodegradable and can capture carbon, at least for the time it's still in the ground.