Question

how global warming is a threat to environment

Answer 1

There is scientific consensus that the Earth's climate is changing due to global warming/climate change caused primarily by the human use of oil, coal, and natural gas. The burning of these fossil fuels releases carbon dioxide into the atmosphere, which traps more heat from the sun. Global warming/climate change is accelerating as planetary temperatures reach record highs. The melting of polar ice and mountain glaciers may cause sea levels to rise by at least three feet, probably much more, and by eighty feet in coming centuries if the average temperature rises five degrees, warming that will be difficult to avoid. Half of the world's plant and animal species are at risk of extinction by 2100 as habitats are destroyed and ecosystems unravel. 

Answer 2

hey buddy...!!
GLOBAL WARMING:
it is mainly caused by emition of toxic gases like co2 by burning...
and release of CFCs in ACs and refrigerator...etc...can be harmful for the ozone layer....
because of global warming the Earth becoming warmer and warmer...which means that the Earth is heating up....
we can see this from earliest age Earth ...which is ice age...where the ice are melted up and we get this ...
even now in the artic poles the ice Berg's are melting...
HOPE THIS WOULD HELP U BUDDY..!!
PLSS MAKE ME BRAINLIST!!!