CO2 Calculator

I know that there are environmentally conscious people who perform a whole lot of carbon footprint calculations wherever they go, so what better way to do so than with the Japan-only CO2 Calculator? This nifty device is able to help you manage electricity use, water, trash and gas by keying in the necessary figures before a result is displayed on its LCD screen. Too bad it is limited to the Land of the Rising Sun only, as I'm sure this solar-powered device will also do pretty well outside of Japan.