One in five people around the world lack regular access to freshwater, which makes up just 3% of the world’s water sources. Most of the 1.5 billion or so people who need to go without freshwater, however, live in arid
Trains are the most efficient mode of transportation we have. They can be even more efficient.
Currently, many new panel designs are opaque, which prevents them from being integrated into everyday objects.
"Semiarid places are now like students who get an A nearly every day,” says Princeton's Dr. Amilcare Porporato. Yet climate change may turn their solar-energy grades to Bs or Cs.
“Our method works with regular brick or recycled bricks, and we can make our own bricks as well,” says Julio D'Arcy of Washington University.
A major drawback to solar energy that it does not work in the shade. Enter the shadow-effect energy generator.