What can be written / talked about:

Introduction
- What is a green economy?
- How widely is it implemented?

Pros
(Can pick any 2 to write about their cause n effect, how it helps in the long run)
- Reduction in greehouse gas emmisions
- Emphasise on renewable energies
- Reduction in waste
- Tax advangtages n subsidied

Cons
(Can pick any 2 to write about how the cons is not worth the high investment made)
- Energy supply may depend on weather conditions
- High maintenance
- May not be suitable for all locations

Conclusion:
- You can compare the pros and cons and conclude which do you feel outweighs the other and why.


For more info, you can visit this link below:
https://environmental-conscience.com/green-building-pros-cons/

Pls try to write it on your own first. The website will help a lot.