Find out about the international norms to regulate the emission of carbon dioxide.

Explanation

Reduce means to decrease the use materials to minimum, e.g. electricity and water.
Recycle means a material that is used once is collected and processed to make some other useful material, e.g. plastic and glass articles, paper, etc.
Reuse means using a thing over and over again instead of throwing it away, e.g. used envelopes, plastic and glass bottles, etc.