LecturerToday I'll give you a simple overview of renewable energy — power that comes from sources nature keeps refilling, so we never run out.
LecturerLet's begin with the most familiar one: the sun. Solar panels turn sunlight straight into electricity, and they work even on cloudy days, just less well.
LecturerNext is wind. Tall turbines use moving air to spin their blades, and that spinning drives a generator that produces power.
LecturerThen there is water. In a hydro station, falling water pushes through a turbine, and this has been used for well over a hundred years.
LecturerA newer source is heat from underground, called geothermal. In some places hot rocks lie close to the surface, and we use that warmth directly.
LecturerThe big advantage of all these sources is clear: unlike coal or oil, they give off almost no harmful gas while running.
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