Question

write global warming and causes

Answer 1

Global warming is the increase in the average temperature of the Earth's near-surface air and the oceans ever since the mid-twentieth century and its projected continuation.

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.

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Answer 2

Greenhouse gases which are present in the earth's atmosphere traps the heat of the sunlight which led to increase in the temp. of earth due to which glaciers are melting and polar bears are decreasing due to this.
causes: gases which are released from the factories.
2) CFCs (Chlorofluorocarbons)
3) Increase in population which has led to decrease in no. of trees.
4) Pollution