Units of carbon captured by UK woodlands can now be tracked online using a new platform.
Woodlands validated by the Forestry Commission's Woodland Carbon Code (WCC) will now be listed on the Markit Environmental Registry.
Forestry Minister David Heath said: "The WCC provides an authoritative means of assurance to those who wish to invest in new woodland planting to compensate for some of their unavoidable greenhouse gas emissions.
"By investing in new woodlands validated as meeting the code's standards, they receive assurance that their investment will be wisely spent on well managed, sustainable woodlands."
Though not a trading platform, the new development allows anyone to see who owns individual units of carbon, and also tracks changes in ownership.
Its ability to track forwards sales of carbon units in long-term woodland carbon projects "brings welcome clarity, transparency and accountability to the developing woodland carbon market in the UK", Heath added.
At the start of this month, 133 woodlands covering an area of 14,200 hectares were registered under the code, and are projected to sequester 5.2 million tonnes of CO2.