Masdar city, a self-sustainable city built in the desert, recycles up to how much of the water used inside the city?

It has been claimed that, under ideal conditions, two months of in-vitro meat production could deliver up to ____ tons of meat from just ten pork muscle cells.

If we were to build 49,000 concentrated solar power plants (100-MW each – a feasible number) it would provide for:

GENius is a machine that collects water from the atmosphere and converts it to drinkable water at a cost of two cents worth of energy per liter. Depending on climate conditions, how much water can it produce per day?

If 170,000 wind turbines had been in the path of hurricane Katrina, what would the outcome have been?

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