Concerns about the permanence of carbon offsets arise mostly about forestry-based projects .
有关于碳补偿永久性的关注主要发生在森林类型的项目上。
Such concerns about permanence are significant enough that the gold standard does not even certify forestry-based projects .
诸如此类的关于永久性的忧患很重要以至于黄金标准都不能保证森林类的项目。
Although existing standards and certifiers differ in many ways , they all address concerns about additionality and permanence .
虽然现存标准和证明书在许多方面都不同，但它们都很关注额外性和永久性。
Avon has devised a rating system that takes account of small indices of permanence and responsibility , such as a mobile phone number or a formal address .
