A huge increase in littering and fly-tipping in woodlands during lockdown has harmed the countryside and put nature at risk, a charity has warned.
The Woodland Trust said there had been a surge of damaging behaviour at its more than 1,000 sites.
The trust and the Daily Mail are proudly supporting the Great British September Clean organised by Keep Britain Tidy.
The public and businesses are being encouraged to help pick up litter in their areas between September 11 and September 27.
It was originally planned for March, as the Great British Spring Clean, and 680,000 people had pledged to take part, but the campaign was postponed because of the Covid-19 outbreak.
The Woodland Trust said litter it had to deal with included drug-taking paraphernalia, the remains of illegal campsites, plastic bags and broken glass.
The cost of clearing up the damage for the year is projected to be about £134,000, at a time when conservation charities have faced financial strain due to the lockdown.
Discarded rubbish can pose a threat to nature in many ways, the trust said. Plastics and metals do not naturally decompose and can persist in the environment for decades, changing the soil composition, while chemicals from more hazardous waste can leak into water courses.
Animals can suffocate in discarded plastic bags, get entangled in plastic can holders, and be injured by broken glass or get trapped in jars.
At the Woodland Trust site at Dering Wood, near Pluckley in Kent, people have chopped down and damaged trees, created camps and dropped litter and drug waste, as well as creating fire pits – forcing the charity to close the car park to try to curb the problem.
At Ashenbank in Gravesend, also in Kent, there have been similar problems and people have even been removing the protected great crested newts to take back to their ponds at home, according to the charity.