Define ""green chemistry"" and ""ecological footprints"".

Green chemistry

It is the process of designing a chemical compound via reducing or eliminating the use or generation of the hazardous substances.

It is a eco - friendly method, which does not harm the nature.

Ecological footprints

It is the tool to measure the demand of humans on nature, the quantity of nature humans require to support economy.

It tracks the demand of the humans via ecological accounting system.