Environmental Science
What is the name of the action plan for sustainable development in the Twenty first century framed in the Rio Declaration on Environment & Development (1992)?

Declaration 21
Rio 21
Action 21
Agenda 21

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Environmental Science
Although the polar regions radiate away more heat energy than they receive by insolation in the course of a year, they are prevented from becoming progressively colder each year by the:

Conduction of heat through the interior of the earth
Circulation of heat by the atmosphere and oceans
Release of latent heat to the atmosphere when polar ice melts
The insulating properties of snow
Concentration of earth's magnetic field lines at the poles

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