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Green coconut shells are very difficult to compost, hence many find their way into landfill. However I have come across a project by Pune Municipal Council where they are shredding the shells to create a mulch which can be applied to the soil, helping to retain moisture and prevent the growth of weeds. You can read more in this https://timesofindia.indiatimes.com/city/pune/Clean-India-shows-way-for-tender-coconut-shells-mess/articleshow/45041087.cms

The other option is to create charcoal from them, which can be used as a fuel or further as a material for odour or colour removal. There is alot of interesting and useful information on the website of the Coconut Development Board https://coconutboard.nic.in/charcoal.htm

Hope that is helpful.

Regards Harriette