<strong>Letters: </strong>Avoided deforestation should not be used as a basis for creating carbon credits, says <strong>David Humphreys</strong>, while <strong>Paul Steele and Anna Ducros </strong>introduce biocredits and <strong>Dirk Forrister</strong> defends current methodologies

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Paris , France General , France , Anna Ducros , Paul Steele , David Humphreys , International Institute For Environment , Shell , United Nations , Plan Vivo ,