Petroleum
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Earth gas / Natural gas consists of methane with 0-20% higher hydrocarbons (primarily ethane). Earth gas also found correlated with other hydrocarbon fuel (methane clathrates), an important fuel source and a major feedstock for fertilizers.
a source that differs from the most commonly used resource. An example of an alternative fuel is corn oil or sugars, which would replace fossil fuels.
Liquid Hydrogen
Common natural resources are resources that are found almost everywhere and are made pretty quickly, these would include trees, water, and wind. Endangered natural resources would be any resource that is almost gone, which would consist of oil, coal, and almost every fossil fuel.
I'd go with Empire Earth 3, but that's just me