Electricity can light your lamps or power your appliances. But electricity needs to be produced first. We need a fuel that can be converted into electricity, such as petroleum (carbohydrates) that is converted into gasoline (glucose). Or solar energy (fats) or wind power (protein...

• In the form of heat and light, solar energy can cover all our energy needs in a clean, versatile manner.
• Photovoltaics, or Solar panels with silicon cells, convert light into electricity as the photon rays of the sun charge up the cells.

Glucose is the primary "fuel" that produce energy.

• Fats are packed into small units called lipoproteins and stored as body fat for later use.
• Proteins are broken into amino acids