You should do a survey-based contingent valuation to assess how much people are willing to pay for these services. There are several online resources to guide you on this.

Hi Sanjeev Sharma

Not sure I have fully understood your question but I do suggest a couple of readings for this topic of yours:

• the Millenium Ecosystem Assessment (https://www.millenniumassessment.org/en/Condition.html) which I believe can help you to better focus on your research topic
• this interesting reading can help you understand a bit better the MEA report (DOI: 10.1073/pnas.0808772106)
• Here you have an example of something that I imagine can be similar to the work you are about to set up (DOI: 10.1016/j.landusepol.2012.12.013)

Hope these inputs may be useful to you!

Valuing Cultural Ecosystem Services (Hirons et al., 2016)

Article Valuing Cultural Ecosystem Services

Re-evaluating the Contingent Valuation Method as a Standard Method for Monetary Valuation of Ecosystem Services (Mellman, 2017)

https://stud.epsilon.slu.se/10307/1/mellmann_n_170627b.pdf

Check MEA report

Ecosystem Services Valuation Database (ESVD) - Official launch of the new ESVD on 14 October 2021, 13:30 CET

More info and registration: https://www.fsd.nl/esvd-online-launch/ and https://us02web.zoom.us/webinar/register/WN_L__c8yKFTomwnOP-cmLOew