Year Seven and Eight pupils – aged 11 to 13 – from Brooke Weston City Technology College, led by their English teacher Alex Cooper, wrote letters to Gordon Brown and local MP Phil Hollobone, produced newspapers and wrote articles about the need to save the local and global environment.

Mr Cooper said the children were deeply affected after watching Al Gore's documentary, An Inconvenient Truth.

He said: "We watched the film and they were genuinely shocked, some of them were questioning what the future will be like and it spurred them on to do something about it.

"We told them to give their articles and leaflets to their neighbours and family, to try and persuade them to do little things like using energy-saving lightbulbs."

In a letter written by Jake Brigstock, 12, he wrote: "Who is causing this? Human beings. What is to be done? Stop pollution. Where is it taking place? Global. When will it stop? When we stop all pollution causes."

Oliver Taylor, 12, said: "We learnt how politics is playing a part in global warming and the effects on the environment."

Jessica Walkeden, 12, said: "We made finger puppets and earrings of endangered species."

Jessie Mitchell, 12, said: "We tell our parents that if they leave the tap on while they're cleaning their teeth they have to turn it off, or when we go out shopping to buy energy-saving lights."

In a letter addressed to 10 Downing Street, Luke Judkins, 12, wrote: "In my town, Corby, things are changing because a new housing development is destroying trees and it is not good for the environment.

"There are so many cars and factories in Corby that it is causing pollution."

Brooke Weston has now signed up to the Evening Telegraph's Green Army Campaign, which swells the total number of people who have joined to well over 3,000.

Caring environmental champions in Corby, Kettering, Wellingborough and East Northamptonshire have signed up to the campaign to do one thing to help the environment.

The scheme was launched in April to help make readers more aware of the impact of their lives on the planet and to help halt climate change.