What is the fine-grained topic of the following text: On World Environment Day this year (2019), with a view to curb the effects of plastic on the environment, the Tamil Nadu government announced a ban of non-biodegradable and single-use plastic and had recommended the use of natural, environmental-friendly products. Only return the topic.
Tamil Nadu government's ban on non-biodegradable and single-use plastic on World Environment Day 2019