conserve - to use without wasting, diversify - to broaden or add variety, fossil fuel - an energy source formed by preserved remains of plants and tiny creatures, hydroelectric power - electricity created by the energy in moving water, microbe - a tiny organism, such as a germ, nonrenewable energy - an energy source that will be used up, oil reserves - the amount of oil that scientists estimate can be recovered from known sources, peak oil - the idea that oil production will reach a high point and then begin to decline, photovoltaic cell - a device that changes light into electricity; also called solar cell, power grid - a system of power plant cables that distributes electricity, renewable energy  - an energy source that can never be used up, revenue - income used to pay expenses, shale - sedimentary rock made from mud or clay, solar energy - energy from the sun, sustainable  - using natural resources to preserve them for the future,

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