Global warming is mainly caused by an increase in the temperature of atmosphere. The main impact of global warming has the greatest effect on drinking water supplies is melting mountain glaciers.
Which gas is responsible for global warming?
The gases that leads to greenhouse effect include carbon dioxide, methane, nitrous oxide, and water vapor, and fluorinated gases.
These gases increases the temperature of the atmosphere and results in global warming.
This leads to the melting of mountain glaciers which makes a great reduction in the availability of drinking water.
Thus, the correct option is A.
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