Environmental Science
The earth's radiative equilibrium temperature is:

The temperature at which the earth is radiating energy at maximum intensity
The temperature at which the earth is absorbing solar radiation and emitting infrared radiation at equal rates
The average temperature the earth must maintain to prevent the oceans from freezing solid
The temperature at which rates of evaporation and condensation on the earth are in balance

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Environmental Science
What is the official name of IUCN?

World Wide Fund for Nature
International Union for Conservation of Nature and Natural Resources
United Nations Environment Programme
United Nations Educational, Scientific and Cultural Organization

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