Renewable energy, often referred to as clean energy, comes from natural sources or processes that are constantly replenished. It includes sources such as sunlight, wind, rain, tides, waves, and geothermal heat using water from hot springs. Renewable energy often provides energy in four important areas: electricity generation, air and water heating/cooling, transportation, and rural energy services. Globally there are over 10 million jobs associated with the renewable energy industries, with solar photovoltaics being the largest renewable employer.

Coal is classified as a non-renewable energy source because it takes millions of years to form. Coal contains the energy stored by plants that lived hundreds of millions of years ago in swampy forests. Also, coal has a finite amount which cannot be quickly replenished and will eventually run out.

Wind has powered boats to sail the seas and windmills to grind grain. Sun provides solar energy from rooftop solar panels on homes that are renewable energy for heating and cooling. A rain droplet-based electricity generation (DEG) is a new form of renewable energy that can be used to combat climate change. Rain entail bridging two electrodes that create a closed-loop circuit that can release stored charges. In 2021, China accounted for almost half of the increase in renewable electricity. Norway is best known for its production of hydroelectricity, a renewable source of water.

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