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natural greenhouse effect click to hear : natural greenhouse effect

The greenhouse effect is an indispensable natural phenomenon; without it, the average temperature, currently 15°C, would be no higher than -18°C.
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See natural greenhouse effect in : french | spanish
reflected solar radiation tropopause heat loss greenhouse gas heat energy infrared radiation absorption by Earth surface absorption by clouds absorbed solar radiation solar radiation

reflected solar radiation click to hear : reflected solar radiation

Thirty percent of solar radiation is sent back into space by clouds, by particles suspended in the atmosphere and by the Earth’s surface.

tropopause click to hear : tropopause

Boundary between the troposphere, where meteorological phenomena are produced, and the stratosphere, which absorbs a large part of solar radiation.

heat loss click to hear : heat loss

Part of the infrared rays reflected by the Earth’s surface is not absorbed and dissipates in space.

greenhouse gas click to hear : greenhouse gas

Gas that traps heat in the atmosphere; composed mainly (60%) of carbon dioxide (CO2), methane (15%) and CFCs (12%).

heat energy click to hear : heat energy

Infrared radiation carries heat energy, which increases the temperature of the atmosphere.

infrared radiation click to hear : infrared radiation

The Earth’s surface reflects infrared radiation, part of which is retained in the atmosphere by greenhouse gases and clouds.

absorption by Earth surface click to hear : absorption by Earth surface

About 50% of solar radiation is absorbed by the Earth’s surface.

absorption by clouds click to hear : absorption by clouds

About 25% of solar radiation is absorbed by clouds.

absorbed solar radiation click to hear : absorbed solar radiation

A portion of solar radiation is converted into thermal energy by gaseous constituents in the atmosphere, in the clouds and on the Earth’s surface.

solar radiation click to hear : solar radiation

All the electromagnetic waves emitted by the Sun.