Changing forms of energy

A few weeks ago a reader called to ask how much oil and natural gas is left in the world, what might be the depletion rate, and when the world might "run out" of oil. I directed him to several sources of information. Much has been written on the subject. I also cautioned him that any data he found would be based on current information and would be subject to change. Over time, reserve estimates change as new fields are discovered and new technologies are created to produce reserves from mature fields.The form of energy we use changes much like reserve estimates. The form of energy used to heat homes is an example. Although today many homes are heated with electricity, such was not the cas...

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