The researchers found that grasslands, savannas and shrub lands were most affected by biodiversity loss on average.

Purvis hopes this report can be a wake-up call to those who design policies. Here's his warning: "Decision-makers worry a lot about economic recessions, but an ecological recession could have even worse consequences – and the biodiversity damage we've had means we're at risk of that happening. Until and unless we can bring biodiversity back up, we're playing ecological roulette."

词汇表 species  （动植物的）种，物种

extinct  消失的，灭绝的

biodiversity  生物多样性

interconnected  （两个或多个事物）互相联系的

ecosystem  生态系统

interfere  影响

pollination  植物授粉

decomposition  分解

framework  框架，体系

planetary boundaries  地球界限（概念）

land surface  大地表面

Natural History Museum  自然历史博物馆

grassland  草原，草场

savanna  稀树草原

shrub land  灌木丛林

decision-maker  决策者

ecological recession  生物衰退

ecological roulette  生态轮盘赌

测验与练习 1.  阅读课文并回答问题。

1. Why is the existence of many species of animals and plants important for humans?

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