In addition, they also open up new business opportunities for forest-based products. Cap-and-trade systems impose a limit on overall emissions that can be traded, while baseline crediting mechanisms incentivise emission reductions through rewarding reducing emissions (crediting) below a business as usual baseline. In 2009, Iceland and Norway joined the EU ETS and it was recently announced that the EU had, in principle, agreed to link the EU ETS with the Australian emissions trading scheme. However, a growing number of compliance and voluntary emission trading schemes and market based mechanisms, have evolved over the past few years that do allow land based offsets to be traded.