要解决这个问题，两个问题必须得到回答。 自然资源和生态环境到底给人类经济活动施加什么样的约束?。
To solve this problem, the two questions must be answered: what is the constraint that the nature resources and ecology environment put on the economic activity of human being?
材料产业是资源（能源）消耗和污染排放的主要责任者之一，并由此产生了深刻的生态环境问题。
Materials industry is an important responsible area of resource (energy) depletion and waste emission, which results in severe ecological and environmental problems.
面对全球森林资源匮乏，生态环境日益恶化的问题，保护环境、保护森林已成为人类的共识。
With the increasing issues of forest decreasing and environment degradation, environmental protection and forest protection have drawn more and more attention from all aspects.
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