4.14

4.14 Understand how an increase in greenhouse gases results in an enhanced greenhouse effect and this may lead to global warming and its consequences

Pollution: greenhouse gases concentration increases. à more infrared light re-emitted rather than escaping à raise average global temperature à GLOBAL WARMING

Consequences: difficult to predict.

- Melting of ice caps in the polar regions

- Raised sea levels

- Change in ocean currents

- Change the ways in which winds are generated

CHANGE IN DISTRIBUTION OF BIOMES (ecosystem, major vegetation)

Ice caps melt, Deserts expand, deciduous forest, coniferous forest distribution change.