The answer is to plant trees.
Trees photosynthesise, like all green plants, turning the polluting carbon dioxide into sugars and oxygen.
Trees are the most efficient oxygen factory plants.
From seeds to trees
Everybody who can borrow a spade can plant a tree.
It needn't cost any money. There is no need to buy trees from nurseries.
You can collect seed (like acorns) from local trees in the autumn.
I reminded Childnet, that as they thought the website was a good idea, they ought to take their responsibility to climate change seriously.
They agreed to have over 100 trees planted through the Cool Kids Project to make up for the greenhouse gases caused by each Childnet winner's flight to London and back.
And during National Tree Week, these trees were planted at Kingstone School, Barnsley by pupils at the school.
The school wanted trees planted to screen them from the nearby M1 motorway.
The trees, would hide the traffic from view, quieten the noise, clean the air and provide habitat for wildlife.
Cool Kids provided the trees, Year 9 at Kingstone School provided the spade power!"
Sarah, 14, Rotherham
If you have a web project you would like to enter for the Childnet Awards, click on the Childnet website link on the top right hand side for more information.
Why don't you write us a Press Pack report - and get it published on the site?!
It can be about anything that's happened in your local area - or your views on the news.