Almost half of the processes that are crucial to maintaining the stability of the planet have become dangerously compromised by human activity. That is the view of an international team of 18 researchers who provide new evidence of significant changes in four of the nine systems which regulate the resilience of the Earth.<img src="//feeds.feedburner.com/~r/sciencedaily/~4/4tij7yoL7Ig" height="1" width="1" alt=""/>
