The ecological environment, which the human survival relies on, was damaged because various irrational behavior of the human race overstepped the natural limit.
由于人类各种不合理的行为超越了自然的极限，破坏了人类赖以生存的生态环境。
The life and existence of the human race are threatened because of the deteriorating ecological environment.
生态环境日渐恶化，人类生活、生存、生命都受到巨大威胁。
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