wind
Because their isn't much water in the desert.
Gabon's most useful resouce is the lumber from the rain forest trees.
Extraction of useful material or energy from a waste stream such as heat from burning municipal solid waste is known as resource recovery.
coal
wind
There are some energy sources, such as wind energy, solar energy, and geothermal energy, that are available in abundance - basically for free. But please note that there is always a cost to convert such energy types into something useful. The energy is free; converting it into useful energy to run machinery is not free.
The sun's energy is most useful to humans after it is converted to electricity or heat energy, which can power homes, businesses, and technology.
sun
How about coal, oil, natural gas, uranium
Some places have more constant winds than others.
Oil is a natural resource that can be converted by humans into other forms of energy such as gasoline, diesel, and jet fuel to power vehicles, machinery, and other equipment for various tasks and activities.
Oil, followed by gas, hydroelectric and geothermal energy.