Many R&D antions on the alternative energy source are already progressing in Korea. In former times, wind or sun energy occupied most of the alternative energy. Recently electric and hydrogen energy has been emerging by pure and efficent, environmetal energy. Electric energy is quite popular, but hydrgen energy has significant problems to figure out. Especially a safety problem on hydrgen energy is the most important and difficult problem. Many scientists do their best in lab to solve it.

Correction: 

 

Many R&D antions nations on the alternative energy source are already progressing in Korea. are using an alternative energy and the sources are already processing in Korea.​ In former times, wind or sun energy occupied most of the alternative energy. In former times, a wind and sun energy are the most used alternarive energy. electric Electric  and hydrogen energy has been emerging by pure and efficent ​efficient environmetal environmental energy. Electric energy is quite popular, but hydrgen hy​drogen energy has significant problems to figure out. Especially a safety problem on ​for a safety problem in hydrgen ​hydrogen ​energy is the most important and difficult problem.​ Many scientists do their best in lab to solve it.​ Many scientist are doing their best in the laboratory to solve it.