planetary boundaries

Scientists warn that human activity has already breached several planetary boundaries, including climate and biodiversity.科学家警告说，人类活动已经突破了几个地球边界，包括气候和生物多样性。

The concept of planetary boundaries defines a safe operating space for humanity on Earth.地球边界的概念为人类在地球上的安全生存空间作出了定义。