Will human beings' selfish acts bring about the Earth's doom?

Yes.If humans continue their foolish ways to pollute the world, soon we will be extinct. Humans are constantly emitting CO2 and thus heating up the world and as most of the adults use their own cars or vehicles because it is more time-efficient and more convenient.But at the same time, the carbon monoxide produced will contribute to the heat trapped in the atmosphere by the "Greenhouse effect" thus this will will cause the currently melting glaciers to melt even more rapidly. Soon, low ground places will be flooded as the world's water level will rise by 2.5%. 

What we can we do to save the Earth?

We can use public transportation  eg.(MRTs and public buses) instead of our own personal vehicles so the carbon monoxide produced will be reduced.We can also use another alternative source of fuel for vehicles which is compressed natural gas(CNG) as it produces lesser carbon monoxide.

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