Question

write a few lines about is 'global warming a serious issue in today's world'

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.[1][2][3] 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 paleoclimateproxy records covering thousands of years.
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