Once the fire is out, the grass and shrub ecosystems should return quickly.

火一旦被熄灭，草和灌木的生态系统就会很快恢复。

We are seeing a decline in major ecosystems like kelp forests, sea life communities, coral reefs and so on.

我们正目睹像海藻丛林，海洋生物群落，珊瑚礁等主要生态系统的衰落。

Ecosystems change over time, with or without the involvement of mankind, so no one can tell what Hawaii should look like.

不管有没有人类的影响，生态系统都会随时间演变，因此没有人可以说出夏威夷看起来应该是什么样的。

Mathematical models have also revealed that food webs may be unstable, where small changes of top predators can lead to big effects throughout entire ecosystems.

数学模型也揭示了食物网可能是不稳定的，顶级肉食性动物的微小改变会对整个生态系统产生巨大影响。

The Role of Ecosystems in Climate Mitigation.

应该注意让生态系统在气候变化中起到作用。