Carbon credit je tool  representing the avoidance, reduction or elimination of atmospheric greenhouse gases (GHG), measured in tons equivalent of carbon dioxide (t CO 2 e). There are three main outcomes of projects generating carbon credits:  

• Prevention emissions, for example by preventing deforestation and forest degradation (REDD + ) . 
• Reduced emissions, for example by restoring peatlands . 
• ABOUT removal and sequestering CO 2 , for example by direct air capture or reforestation  

They exist three types of carbon markets , on which is traded in carbon credits, one of them is  unregulated voluntary carbon market  (VCM)  , where are you individuals or companies  they claim credits for your own voluntary climate commitments.  Evidenceon low prices and mixed credit integritythey ledkconcerns the Committee on Climate Change (CCC), thatbusinessesthey can despite yours uncertainty to use compensation like compensation for direct reducing emissions.

The effectiveness of carbon credits is affected by their integrity, which is evidence that globally the amounts of emissions that can be avoided or reduced are overestimated. There are several initiatives that seek to address issues related to the integrity of carbon credits, such as the Oxford Principles,  the Science Based Targets initiative and the Voluntary Carbon Markets Integrity Initiative. (Jonathan Wentworth)