You"ve seen our Global Warming Mug, now witness the CO2 Mug! This colour changing mug can be filled with a hot beverage to show you who the biggest offenders of CO2 emissions are. Want to know how big your countries Carbon Footprint is? Just make a cup of tea and watch the depressing reality appear before your eyes! An ideal eco gift for Birthdays, stocking fillers and office gifts, why not treat someone to a Colour Changing CO2 Mug and change their world. We all like to do our bit for the environment whether it is recycling, forcing kids to walk to school in the rain instead of driving them there or farting less to help the hole in the Ozone Layer. This Colour Changing CO2 Mug comes in packaging made from recycled materials and is an educating tool that you can learn from whilst dunking your Kitkat in it.