他们力图解决世界上各种事关环保的特殊问题，如选择何种生态系统，能源和资金问题该怎么解决。
They all move to address particular problems that are conservation-related. That is, the choosing of which ecosystems to focus energy and resources on, around the world.
采用论述、图解及数学关系式的方法，较深入地分析了资源、环境与生态系统的关系。
Relations between resources, environment and ecosystem are analyzed in detail by methods of description, diagrams and mathematical relationships.
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