这种临界点是否是人类活动的结果目前尚不清楚 — — 但在人类开始干预地球能量平衡前长达11,500年的全新世时期却从未出现过类似的改变。
It is not completely clear whether humans have caused this tipping – though nothing like it has ever occurred during the 11,500-year Holocene period before humans started interfering with the planet’s energy balance.