And plants basically capture that energy that is stored in light that comes from the sun and it transforms that energy into the chemical bonds within the sugar molecule. So what happens is in the sun we have all these different nuclear reactions which take place and produce they release energy. And that energy is then stored in electromagnetic waves which propagate through space. And some of this electromagnetic radiation eventually makes its way to the Earth and to the plants on Earth. And so what these plants do is they take the carbon dioxide in the atmosphere, that's the carbon source. And then they take the water found in the soil and they use the energy stored in light.