Question

note on global warming and how its causes

Answer 1

Global warming, also referred to as climate change, is the observed century-scale rise in the average temperature of the Earth's climate system and its related effects. Multiple lines of scientific evidence show that the climate system is warming.Many of the observed changes since the 1950s are unprecedented in the instrumental temperature record, which extends back to the mid-19th century, and in paleoclimate proxy records of climate change over thousands of years
 
The phenomenon is sometimes called "anthropogenicglobal warming" or "anthropogenic climate change" in view of the dominant role of human activity as its cause.
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Answer 2

The increase in the Earth's temperature due to increase in the amount of greenhouse gases such as methane, carbon dioxide, carbon monoxide and nitrous oxide is known as global warming.