Why are catalytic converters used in automobiles?</h2></div>

Kyoto protocol is a multination international treaty for</h2></div>

<b></b>Organic farming is a farming system with minimal or no use of chemicals such as</h2></div&gt…

Instead of fertilizers, organic farming uses<br> </h2></div>

Chlorofluorocarbons cause<br> </h2></div>

Depletion of ozone layer is mainly due to</h2></div>

Name the unit which is used to measure the thickness of ozone layer?</h2></div>

When domestic sewage mixes with river water, __________<br> </h2></div>