In the process of photolysis, water molecules are broken down to produce oxygen, hydrogen and electrons. Electricity or fuel produced directly from hydrogen and electrons is called green energy. In 2011, scientists at the Massachusetts Institute of Technology created an artificial leaf. Place the artificial leaf in water in the presence of sunlight. Electricity or fuel is generated by breaking water molecules under the influence of light to form hydrogen and oxygen gas. Attempts are being made to make electricity or fuel by directly using hydrogen and oxygen created from water in natural ways.