The world has an energy problem. The supply of the main source of energy, the oil, is gradually running out. The use of oil, coal and other fossil energy sources is polluting the planet with greenhouse gasses that are capturing heat from the sun rays in a dangerous degree.

But also most alternative energy sources give problems for the environment. Some of them take up vast areas of land, like bio-fuel production, extensive solar cell plants and wind mills. Extensive use of croplands to produce bio-diesel, methanol, ethanol or other bio-fuels can cause a chronic hunger catastrophe. Others, like nuclear power stations can accidently destroy the environment of vast areas and potentially kill millions of people. Also leakage from deposits of nuclear waste can give the same effect. But nuclear power is very clean if everything goes well.

As it seems, there is no easy or elegant political or technical solution to the problem. The problem must be challenged with a clever combination of several means.

An important module in the solution is energy economization. Where it is possible one must use engines, technology and logistics that utilize the energy as effectively as possible. One must also stop using energy on activities that do not result in any added comfort, do not give gain of any sort, or give only marginal resulted value. By using the energy sources more effectively, the World's energy need will perhaps drop by so much as 30%.

Then the use of oil and coal must be replaced with all kinds of alternative energy sources, but no alternative must be used in such an extend or such a way that it cause new problems.

One part of the solution is using bio diesel or other bio-fuels made of waste from croplands. In the process of converting the waste to fuel, the content of minerals in the waste can probably also be extracted and sold as fertilizers. But it is unethical to grow crop just for making bio-fuel, since that can cause food shortage and rise of food prizes.

Use of solar energy to make electricity will be a great part of the solution. Theoretically every roof and outer wall in the world can be covered by solar cell panels, even though it will not be estheticly or practically possible to go so far. Wastelands that have little other value can also be used to mount large solar cell plants. There is however a limit on how much solar cell panels you can mount before the environment is disturbed.

Much more electricity can be produced by wind-mills than today, but there is a limit on the number and extent of wild-mill parks you can set up before the environment is heavily disturbed. In areas like Denmark and Northern Germany the disturbing effects can already be seen clearly.

In many areas the waves in the sea or the stream of tide water can be used to produce electricity in a commercially economical fashion, but again there is a limit on how far you can go in building wave or tidal power plants before you destroy the environment.

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