Nursery children were given awards for their commitment to protecting the environment.
The little eco-warriors are from The Co-operative Childcare in Station Road, Watford Junction, and Altham Gardens in South Oxhey.
The nurseries now hold the "Bronze" and "Silver" awards accredited to "Eco-Schools".
The youngsters took part in the national recycling campaign, Keeping Britain Tidy.
Sarah Hurn, nursery manager at The Co-operative Childcare in Watford Junction, said: “We work hard to create the best nursery environment possible for the children.
"The Eco-School accreditation not only helps us make sure we do so in the most environmentally friendly way possible, but it also provides brilliant opportunities for children to explore the world around them."
One little boy went home from nursery after helping recycle at the nursery and asked his mum at a supermarket till why she was using plastic bags since they were dangerous for wildlife.
Ms. Hurn added: “Stories like this sum up how important and rewarding it is to teach the next generation as much as we can about the world they live in.”
The nursery in South Oxhey progressed to ‘Silver’, meaning children have begun working on their next sustainability project, on a topic such as marine life or global citizenship.
The youngsters have been out on nature walks, building homes for hedgehogs and feeding stations for butterflies, and saving electricity by turning off light switches when not in use.
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