[FW.04]Which of these is the most practical method to prevent global water shortage? Stop planting trees and shrubs in gardens.
Conserve, recycle and reuse water in households.
Stop using appliances like washing machines and dishwashers.
Discourage setting up of power plants which need cooling water.

Conserve, recycle and reuse water in households.

Explanation:

the transfer of energy between two molecules spaced just nanometers apart plays a key role in many technologies, including photovoltaics, quantum information systems, lighting, and sensors, as well as in biophysics to measure nanometer distances and in photosynthesis. but an open question in this area is what effect, if any, the surrounding photonic environment has on this nanoscale energy transfer. by designing and performing a carefully controlled experiment to answer this question, scientists have settled the debate and found clues to improving the efficiency of many of the technologies that rely on this process.

explanation: