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Assume that by devoting all its resources to the production of X, nation Alpha can produce 40 units of X. By devoting all its resources to Y, Alpha can produce 60 Y. Comparable figures for nation Beta are 60 X and 40 Y. Beta would prefer terms of trade at, or close to, 1X = 1½Y.
Radioactive Isotope
An isotope of an element that has an unstable nucleus and emits radiation during its decay to a stable form.
Greenhouse Effect
The process by which radiation from a planet's atmosphere warms the planet's surface more than it would without this atmosphere, largely due to greenhouse gases.
Troposphere
The lowest layer of Earth's atmosphere, where weather happens and where most of the planet's atmospheric water vapor exists.
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