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Global warming is the temperature of Earth's surface, oceans and atmosphere going up over tens of years. Average temperatures today are about 1 °C (1.8 °F) higher than 150 years ago, but in some parts of the world it is less than this and some more.
What is global warming and its effects?
Global warming is projected to have a number of effects on the oceans. Ongoing effects include rising sea levels due to thermal expansion and melting of glaciers and ice sheets, and warming of the ocean surface, leading to increased temperature stratification.
What is global warming and the greenhouse effect?
The greenhouse effect is the process by which radiation from a planet's atmosphere warms the planet's surface to a temperature above what it would be without this atmosphere. Radiatively active gases (i.e., greenhouse gases) in a planet's atmosphere radiate energy in all directions.