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The energy source with the highest net energy ratio for space heating is
Efficiently
The ability to achieve a desired result without wasting materials, time, or energy.
Scarcity
The fundamental economic problem of having seemingly unlimited human wants in a world of limited resources, leading to the necessity of making choices.
Economize
The act of reducing waste or optimizing the use of resources to save money or achieve greater efficiency.
Affluent
Describes individuals, communities, or nations with a high level of wealth and income, typically measured by the standard of living and purchasing power.
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