Palaeogeography: Devonian tetrapod from western Europe

Several discoveries of Late Devonian tetrapods (limbed vertebrates) have been made during the past two decades, but each has been confined to one locality. Here we describe a tetrapod jaw of about 365 million years (Myr) old from the Famennian of Belgium, which is the first from western continental Europe. The jaw closely resembles that of Ichthyostega, a Famennian tetrapod hitherto known only from Greenland. The environment of this fossil provides information about the conditions that prevailed just before the virtual disappearance of tetrapods from the fossil record for 20 Myr.     

环境政策创新:论在中国开征环境税收

在中国经济转型以及经济全球化的社会经济背景下,分析了在中国实施环境税收制度的必要性与可能性。从制度分析的角度剖析了环境税收制度相比于命令－控制型政策、排污收费制度和排污许可证制度的优化,从而从理论与实践两方面探讨了在中国进行环境政策创新,开征环境税收的重要意义,认为在短期内,排污权交易政策的制度条件尚不成熟,环境政策体系应该采取税费并存逐步过渡到以环境税收为主的方式。     

面向产品系统的环境管理工具:生命周期评价

本文系统地概述了环境管理工具的发展,生命周期评价的起源和发展,思想框架,主要特点、意义、评价基本方法及其应用、局限性.