Some ecosystems show little response [to climate change] until a threshold or tipping point is reached where even a small perturbation may trigger collapse into a state from which recovery is difficult . ….[S}uch collapse may be altered by conditions that can be managed locally…. [This] provides potential opportunities for pro-active management.…[C]rises in iconic UNESCO World Heritage sites illustrate that such stewardship is at risk of failing. The term “safe operating space” frames the problem of managing our planet in terms of staying within acceptable levels or “boundaries” for global stressors [Such as climate change]….
Obviously, local interventions are no panacea for the threats of climatic change. For example, melting of arctic sea ice with its far-reaching ecological consequences cannot be arrested by local management. However, ways of building climate resilience are emerging for a variety of ecosystems, ranging from control of local sources of ocean acidification to management of grazing pressure on dry ecosystems,World Heritage Areas.
The Doñana wetlands in southern Spain provide the most important wintering site for waterfowl in Europe. They contain the largest temporary pond complex in Europe, with a diversity of amphibians and invertebrates. Despite the site’s protected status, the marshes are threatened by eutrophication due to pollution and reduced flow of incoming streams, promoting toxic cyanobacterial blooms and dominance by invasive floating plants that create anoxic conditions in the water. In addition, groundwater extraction for strawberry culture and beach tourism also has major impacts. Little has been done to control these local stressors, leaving Doñana unnecessarily vulnerable to climate change. UNESCO has just rated this World Heritage Site as under ‘very high threat’.
The Great Barrier Reef is the largest coral system in the world. In response to multiple threats, fishing has been prohibited since 2004 over 33% of the Great Barrier Reef Marine Park, and efforts have begun to reduce runoff of nutrients, pesticides, herbicides and sediments from land. However, these interventions may be too little, too late. Approximately half of the coral cover has been lost in recent decades, and the outlook is “poor, and declining” with climate change, coastal development and dredging as major future threats. The World Heritage Committee has warned that in the absence of a solid long-term plan, it would consider listing the reef as “in danger” in 2015.
More available online Creating a Safe Operating Space for Iconic Ecosystems By M. Scheffer et al, 2015