Litter on beaches

The people who had interviewed have different impressions on the litters on the beach. It's anecdotal.
One man makes periodical reports on the data of litters and he doesn't say the amount of them have been decreasing. He just says changing.
I can say that the beaches have been cleaned because of the effort of locals.

Litter on beaches has improved, islanders say
https://www.bbc.com/news/articles/cq5d7g8njzqo

<words>
islander (accent)
no two ways about it [Collins] [spoken, emphasis] you are emphasizing that there is no doubt at all about a particular situation or about how it should be interpreted.
breathe down someone's neck [Collins]to stay close to someone, esp to oversee what they are doing [quote]without breathing down people's necks all the time you're never going to solve the problem
wind up (pronunciation) [Collins]When you wind up an activity, you finish it or stop doing it.
in the main [Collins]If you say that something is true in the main, you mean that it is generally true, although there may be exceptions.
a fair bit of {Wikitionary](informal, UK) a little bit, somewhat, kind of; a good amount