Countryfile BBC1, 6pm

The Snowdonia National Park is one of the country’s most popular tourist destinations. While that sounds as if it’s a good thing, Matt Baker and Joe Crowley discover why it’s actually a problem – the huge number of visitors is taking its toll on the landscape. Baker hears about the impact of microplastics left behind by walkers, while Crowley lends volunteers a hand as they attempt to restore wrecked footpaths.