It exists in many layers, ecosystems, species and genes across many scales -- international, national, local, community -- and doing for nature what Lord Stern and his team did for nature is not that easy.
它存在于多个层面中： 各个规模的生态系统，物种，基因--- 无论是国际间的，民族间的，本地的，还是社区内的--- 而且像Stern爵士和他的团队那样去研究大自然 绝非易事。