Made by the Aussies, it's a
greenhouse gas calculator - it determines how much CO_2 you produce in a year (3 tonnes per year per person is the sustainable amount, 24 is the average Aussie), and therefore when you should kill yourself so you don't use more than your fair share.
I produce 15.0 tonnes of CO_2 per year (according to their calculator), and therefore I should die at age 15.4. At least I'm better than average! :-P