GEOLOGY

Detailed explanation-1: -Globally we see that coal, followed by gas, is the largest source of electricity production. Of the low-carbon sources, hydropower and nuclear make the largest contribution; although wind and solar are growing quickly.

Detailed explanation-2: -Oil is the world’s largest energy source today. It is the dominant source of energy for the transport sector in particular. This interactive map shows the share of primary energy that comes from oil across the world.

Detailed explanation-3: -Primary energy sources take many forms, including nuclear energy, fossil energy–like oil, coal and natural gas–and renewable sources like wind, solar, geothermal and hydropower.

Detailed explanation-4: -One of the most important sources of energy is the sun. The energy of the sun is the original source of most of the energy found on earth. We get solar heat energy from the sun, and sunlight can also be used to produce electricity from solar (photovoltaic) cells.