Climate Change Disappearing Coffee Mug - Add Hot Liquid and Watch What Will Happen When The Ice Caps Melt - Comes in a Fun Gift Box - by The Unemployed Philosophers Guild 10 oz. mug. Heat changing mugs are microwave safe, but not dishwasher safe. From the Unemployed Philosophers Guild. Don't worry. We are employed, just not as philosophers. We're a small, Brooklyn based company specializing in gifts for the sophisticated gift giver. For whatever you need, we have presents of mind. When you pour in hot liquid, the mug shows what will happen when the polar ice caps melt before your very eyes, coastlines shrink and ocean levels rise, Florida dissolves and Central America all but vanishes. Show you care with a Climate Change Mug, it won't fix the problem, but it will illustrate it in a really cool way. 3" diameter, 10 oz. Disappearing mugs are not dishwasher safe but are microwave safe. You have a choice. You can drink your tea or coffee from a mug that says "I Love Kittens" or "Go Packers" or you can help spread the message with this Climate Change Mug. Of course, not everyone wants to be reminded of planet-wide catastrophe during their afternoon coffee break. But if you're the type of person who confronts difficult issues even during your downtime, you should consider getting one.