Two thousand trees will be planted by Caerphilly County Borough Council’s ranger service.
The trees are being planted during National Tree Week, which began on Saturday, November 23 and finishes on Sunday, December 1.
As part of the council’s climate emergency declaration, the council will plant 450 square metres of new hedgerows at four countryside parks and two schools.
Trees are being planted at Riverside Park, Pen y Fan Pond, Parc Penallta and Parc Coetir Bargoed, as well as Ystrad Mynach Primary School and Bedwas Comprehensive School.
Primary school children from Tyn y Wern, Rhiw Syr Dafydd, Ysgol Penalltau, St Gwladys and Ystrad Mynach Primary are taking part in the tree planting, as well as students from Bedwas Comprehensive.
A climate emergency was announced by the council, as well as the National Assembly for Wales, earlier this year.
Senior environmental education ranger, Andy Wilkinson, said: “Everyone is now fully aware of the climate change emergency threatening our world, so we wanted to give the community an opportunity to do something about it here in the county borough.
“The school children have been amazing, leaping at the opportunity to start creating a brighter future.”
Cllr Nigel George, cabinet member for neighbourhood services, said: “It’s fantastic to see the pupils so passionate about contributing to making Caerphilly County Borough a cleaner, greener and better place.
“I hope that in doing this, it will raise the awareness of climate change whilst giving the local community an opportunity to get involved in improving their local environment.”