Wild Card's description 
The interactions among megacities, air quality and climate have long been a concern. One major problem is the air pollution caused by vehicles. The development of hydrogen-fuelled vehicles on the other hand had always been always seen to be unviable due to its cost, efficiency and greenhouse emission. But a major car manufacturer finally managed to develop hydrogen fuel-cells which have been proved as a better long term technology than biofuels or electric cars. Better still, its also incorporated another technology so that the engine's residue, which is water, can be directly drinkable. What will make this Wild Card interesting? It would be unpredictable Other info: http://en.wikipedia.org/wiki/Hydrogen_vehicle http://cordis.orgropa.org/fetch?CALLER=FP7_PROJ_EN&ACTION=D&DOC=58&CAT=PROJ&QUERY=01215dc39866:add3:0fa89ccf&RCN=88856