UN will build statues for invnetors, not to mention nobel honor:

CO2 absorbing device mimicking plant photosynthesis

cheap/efficient electricity car (nuclear power being the ultimate source)

cheap/efficient solar power

cheap/efficient underground traffic (not just metro/tube)

artificial blood ( i always dream kind of a powder for long term storage, when needed just add sterile water)

optical fiber communication

cheap/efficient water recycling and purification

cheap/efficient nicotine substitute

....