Tag: Holocene

Arctic Sea Ice is Historically Extremely Variable

Much concern has been made about the dramatic drop in Arctic sea ice levels over the past decade, but new research out of Denmark suggests that the extent of the Arctic sea ice is extremely variable.

9 ‘Planetary Boundaries’ Cited as Crucial for Human Survival

A group of 30 leading Earth and Environmental scientists is proposing “nine planetary boundaries”, or “safety zones”, that must not be crossed, in order to preserve the planetary and environmental balance that human civilizations (and much of the rest of the biosphere) require. Crossing these boundaries–and three of them may have already been crossed–could “generate unacceptable environmental change for humanity.”