|  | This mug is a novel present for all those concerned with carbon footprints and global warming - which is most of us!
The mug has a map of the world on it and as you add a hot drink, the heat sensitive print reveals a colour coded image of the planet, highlighting the degree to which countries around the globe contribute to the world"s CO2 emissions.
When the mug is cold, a print of the world is displayed.
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