Hi Aizawal

Agenda 21 is explained in 50 words below:-

Agenda 21 is the initiative taken by the united nations and it is accepted by more than 178 countries , it is a global plan of action to promote sustainable development.
Agenda 21 suggests central Government and state government to fight against :-

• pollution
• poverty
• Agenda 21 also suggests to save natural resources.

I hope that you find this helpful

Thankyou