Now here's a clever way of demonstrating the rather unfortunate consequences of global warming for Planet Earth. You see, conventional wisdom tells us that when the ravages of climate change have had their way with us, the habitable surface of the earth will be, how can we put it... much reduced. But by how much? And will I still be able to pop down the road to the newsagent for a packet of Revels?

This revolutionary mug has an answer. Outwardly it looks just like any other mug with a familiar map of the world as we know it today. The magic happens, however, when hot liquid is poured in. And slowly, remorselessly, the coastline erodes under 100 metres of sea water as the polar ice caps melt.

Heat sensitive surface technology physically changes the look of the mug as formerly lush green areas of landmass change to a deep salty blue.

The British Isles, if you're interested, becomes a tiny archipelago of green dots, all adrift and floating in the North Atlantic. Let's hope you and your newsagent are on one of them...

A highly educational tool, it brings to life the most challenging issue of our time to life in no uncertain style - and puts the power to explain right in the palm of your hand. And better still, it works as a real mug, too.

Cutting edge heat-sensitive drinking technology is at last making a statement. And now you can, too. So don't just buy one. Buy one for the whole family.