Beach litter mostly from inland, Marine Conservation Society claims
Litter levels on Welsh beaches will only fall if people cut the amount of rubbish they drop on the street or flush down drains, campaigners say.
A Marine Conservation Society (MCS) survey found the amount of litter on Welsh beaches in 2012 had risen by almost half compared to 2011.
It estimates that 80% of the rubbish on shorelines comes from inland sources and is blown or washed to the coast.
Matthew Richards reports from Black Rock Sands near Porthmadog.