A subject based article index is offered, covering topics such as biodiversity, climate, nuclear energy, sustainability, and transport.

还有以题目分类的文章，包括生物差异性，核能，可持续性等。

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However, the index for temperate regions rose 31%, as some species showed signs of recovery after huge biodiversity losses the previous century.

CNN: Earth 'going downhill' as consumption rises, report says