If the law of Conservation is true, why are people concerned about energy uasge?

Much discussion has focused on the need to drive more efficient cars and use less electricity. If the law of Conservation is true, why are people concerned about energy uasge?

Because if you take the energy and waste it on something useless then someone else would lack this energy.

Not all energy is in a form useful to us.

Mostly they are concerned because it cost money.

Because all energy ends up as wasted heat dissipated into the environment.

Because the energy we are using is solar energy stored up over million of years in the form of oil and coal. We are depleting this form of energy much faster than it can be replaced. Eventually we will have to transition to another form of energy, however, we'd like to avoid a dramatic drop in overall consumption of energy in the process (significantly affecting our society).

Although energy is conserved, its use results in degradation so that it becomes of no further use. Hence, supplies of energy are necessary, and the question of how to obtain such supplies is of the greatest importance to today's economy.

why not

Because - contrary to what people would have you think - it is not energy we use (which is, as you say, conserved) but entropy.

And entropy is not conserved - it rises.

Only low entropy energy is of any use to us. The sort that comes initially from the sun (or nuclear power). You get a lot of energy concentrated into a small number of states - a small number of high energy photons from the sun, for instance. This is low entropy.

Once used in our machines there is precisely the same energy, but it is spread over a lot of states - noise, lots of low energy photons, heat. This is high entropy.

One possible end for the whole universe is for all its energy to be spread uniformly through the maximum possible number of states - everywhere tepid, nowhere hot, everywhere the same.

But its also important to note that black holes have the unusual property of concentrating entropy. A black hole has the highest entropy perunit volume that is possible in the universe.

Because once the energy is consumed to run the car it is used to power the wheels, lights, etc.' Then the energy is acted upon the ground which dissipates the energy and reacts with an opposite force which propels the vehicle.

The problems is that the original form of the energy (gasoline) is now mechanical energy and is of no use once dissipated.

To make is usable again it needs to be gasoline which takes an extremely long process in nature.

Hope that helped

Energy is turned from usable forms to non-usable forms. High energy molecules like gasoline, natural gas, etc, are reacted into low energy ones like water, and CO2 so we can use that energy to do things. Energy waste, in the form of heat and waste products, is unusable with our technology. They contain energy, but we cannot harness it.

People are concerned by energy usage because we are quickly using up all the easily usable forms of energy, which are considered nonrenewable resources. The forms of energy that can be considered everpresent, like solar, geothermal, wind, or hydroelectric, currently cannot account for the total energy usage of the world.

the law of conservation does state that energy can neva be lost but it changes from one state to another. so eventually most of our energy is changed into another state like heat loss or other which we have no use for so it counts as a loss (orginally according to the law its not)

wat would be most efficient in these energy loss concernes is to be abke to recycle this energy (leg. lost heat energy) so that its no longer a loss but energy for us to use all over again..

hopefully soon there would be a solution for these concerns:)

thats one of those things that i refuse to focus on, ever.