Payments for Ecosystem Services (PES) and carbon credits sound like a good idea but I’m not sure how much they benefit rainforest conservation. Behind my suspicion lies a concept that I have been aware of for a while but only recently learned that it has a name – ‘additionality’. It’s a new jargon term which hasn’t yet made it into the dictionary. In understanding what it means I was lucky to meet a chap called Mike Packer who patiently and concisely explained things to me. Mike is the founder of a company called...