unsustainable

The current rate of global warming is unsustainable for many polar animal species.

(Chinese) 目前的全球变暖速度对许多极地动物物种来说是不可持续的（会导致灭绝）。

Relying solely on credit cards to pay bills is an unsustainable financial habit.

(Chinese) 仅依靠信用卡付账是一种难以为继的理财习惯。