Most projects don't have connections to companies that want to buy carbon credits to be more sustainable. So they often sell their active credits to intermediaries — brokers, resellers, and retailers. Active carbon credits can pass from one hand to another without changing their status. But when a buyer wants to use a credit to compensate (or offset) GHG emissions for carbon accounting purposes, their credits need to be retired. After being retired, the carbon credit has fulfilled its duty - no one else will be able to claim a carbon removal or reduction for this credit.