According to the Starbucks’ impact calculator, by using a reusable travel mug for each of my three cups of coffee every day (stop judging me), I can save 21 trees over the next 50 years. If 10,000 people did the same thing, 343 acres of trees coulc be saved. It could also save millions of cups from ending up in the landfill or worse, on the ground.

The impact calculator is part of Starbucks’ The Big Picture campaign. Starbucks is asking people to switch from paper cups to reusable travel mugs and to pledge to do so. And, if you bring a reusable travel mug to on April 15, Starbucks will fill it for free.

So far, 27,548 people have pledged at the website to switch from paper cups to reusable travel mugs. I switched from paper to reusable years ago. It just makes sense. How about you?

The opinions expressed by MNN Bloggers and those providing comments are theirs alone, and do not reflect the opinions of MNN.com. While we have reviewed their content to make sure it complies with our Terms and Conditions, MNN is not responsible for the accuracy of any of their information.