KWT

At the end of KWT's 40th anniversary year it said cigarette ends still made up the largest proportion of litter.

Sheen, who lives in Los Angeles, said he was approached by KWT last year when he performed his biblical play, The Passion, in Port Talbot.

Cigarette ends continue to pose problems for KWT's army of volunteers as they did back in 1972, and discarded butts make up the largest proportion of litter.

In a bid to tackle the problem, KWT launched its biggest ever campaign against smoking related litter earlier this year.

However, Sheen said parts of some communities had become "wasteland areas", and KWT was spearheading projects to transform them into green community areas.