Sunlight is available only during day. Most of the energy requirements due to lighting needed at night, have led to serious and adverse activities related with construction of dams etc. Energy due to similar fission/fusion explosion, if allowed to take place on moon can provide earth with enough energy. This would be enough to take care of the energy requirements at night. With opto-powered devices, service economy can take the global intelligence to greater heights. Planting enough saplings wuold also cause reduction of carbon emission, as they would now be used to generate more oxygen. Emissions by plants at night would also decrease.