Starbucks Saves the World!

I recently posted that if global warming can be controlled by carbon burial, then we can control it by overcooking food and throwing it out. More recently, I've seen Starbucks coffee described as charcoal-fired mulch. If Starbucks burns its coffee grounds to the point of non-biodegradability and then throws them out, could they be alleviating global warming? Is Starbucks responsible for the halt in global warming in the past decade?