Me walking by food to the next Supermarcet to save the enviroment and than there is this huge dome heated during the whole winter to have a tropic climate in february in the middle of somwhere in Germany,(reply>), If I remem er correctly, the heat is mostly a byproduct from a powerplant or something similar. So it is using whag is already there and would be otherwise wasted. It carbon footprint probably still sucks,(reply>), Considering how much carbon emissions are created by air travel it might work out if 1 out of 10 visitors doesn't take a plane to Mallorca,(reply>), The heat of the Powerplant would go to waste otherwise. This way it has atleast an use.,(reply>), @Yannick oof,(reply>), To make it even better, it uses heat produced by a coal fired power plant right next to it