A national education campaign run by glass manufacturers has seen 150,000 children and more than 1,000 primary schools pledge to recycle glass.

The ‘Glass Guardians’ campaign used Maths, English, Sciences and PSE activities over the summer term to help children aged 5-11 understand why recycling glass is important.

It was the work of British Glass together with the Friends of Glass movement which has been driving the campaign.

Dave Dalton, Chief Executive of British Glass said: “We’re delighted that the children are so enthusiastic – some at a very young age – about the qualities which make glass unique and precious, and why it does not damage the environment.

“They’ve learned through a range of absorbing activities the reality of the endlessly recyclable nature of glass.

“They’ve all gone home and passed the message on – and we all know that pester power works!”

The children, including those at 80 schools in Scotland, promised to carry on recycling and 300 schools entered a competition to show how they much they meant it.

One school entered from as far afield as Accra in Ghana.

The judges looked for creative, original pledges that showed effort and an understanding of the issues surrounding recycling and environmental impact.

The best pledge made was won by Fetterangus school in Aberdeenshire with the Scottish primary school.

They received an Amazon Fire 7 tablet and £500 worth of equipment vouchers.

Their pledge took the form of a video with the children singing an adapted version of ’Ten green bottles’.