We don't know yet what ecological impact it might cause over time.

我们不知道它是否会随时间推移而对生态造成影响。

Moreover, how do we quantify the ecological and economic impacts of such changes?

此外，我们如何量化此类变化的生态和经济影响？

The population density of such a tower could help lower the individual energy requirements of each inhabitant, reducing the ecological impact of the population as a whole.

这种塔的人口密度可以帮助降低每个居民的个人能源需求，从而减少整个人口对生态的影响。

They thus provide a unique perspective on the nature, scale and future long-term ecological impact of the current human-produced biodiversity crisis, the so-called Sixth Extinction, and therefore the importance of protecting modern biodiversity.

因此，它们为当前人类造成的生物多样性危机（即所谓的第六次灭绝）的性质、规模和未来长期生态影响提供了独特的视角，以及保护现代生物多样性的重要性。