Hanson supports world-first carbon sequestration field trial Crushed basalt donated from Hanson’s Builth Wells quarry in Powys is being used in a field trial to measure the impact it can have on removing carbon dioxide (CO 2) from the atmosphere.The world-first project by The Carbon Community, a charity dedicated to creating forests and accelerating carbon removal, aims to define a new reforestation approach to accelerate and enhance the sequestration of CO 2 in trees and soil and improve biodiversity. In May, more than 25,000 trees have been planted on 11 hectares just outside the Brecon Beacons in Wales. The project will assess the effects of using live soils from nearby forests to reintroduce microbes and organisms to increase tree survival rates as well as enhanced rock weathering (ERW) on carbon sequestration.