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All reversible engines operating between the same two temperatures have the same efficiency.
Earth's Surface
The outermost layer of the Earth, consisting of the crust and upper mantle, and characterized by landforms, water bodies, and living ecosystems.
Ecological Footprint
A measure of the impact of a person or community on the environment, expressed as the amount of land required to sustain their use of natural resources.
United States
A country located primarily in North America, consisting of 50 states, a federal district, five major self-governing territories, and various possessions, known for its significant influence on world affairs in terms of politics, economy, and culture.
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