‘Essentially, we would be leaving the world as we know it … ‘
By Summit Voice
FRISCO — Global warming is likely to radically transform more than 80 percent of the Earth’s ice-free landscapes by the end of the century. boreal forests will be transformed into temperate savannas, trees will grow in the Arctic tundra and some of the world’s rainforests will disappear, according to a new study from the Potsdam Institute for Climate Impact Research.
“Essentially, we would be leaving the world as we know it,” said PIK scientist Sebastian Ostberg, describing the findings of a study published their results in Earth System Dynamics, an open access journal of the European Geosciences Union.
The researchers said “nearly no area of the world is free” from the risk of climate change transforming landscapes substantially, unless mitigation limits warming to around 2 degrees Celsius above preindustrial levels.
The profound transformations of land ecosystems have the potential to affect food and water security, and hence impact human well-being just like sea level rise and direct damage from extreme weather events.
“The research shows there is a large difference in the risk of major ecosystem change depending on whether humankind continues with business as usual or if we opt for effective climate change mitigation,” Ostberg points out.
But even if the warming is limited to 2 degrees, some 20 percnt of land ecosystems — particularly those at high altitudes and high latitudes — are at risk of moderate or major transformation, the team reveals.
The researchers studied over 150 climate scenarios, looking at ecosystem changes in nearly 20 different climate models for various degrees of global warming.
“Our study is the most comprehensive and internally consistent analysis of the risk of major ecosystem change from climate change at the global scale,” said Wolfgang Lucht, also an author of the study and co-chair of the research domain Earth System Analysis at the Potsdam Institute for Climate Impact Research.
Few previous studies have looked into the global impact of raising temperatures on ecosystems because of how complex and interlinked these systems are.
To get around this problem, the team measured simultaneous changes in the biogeochemistry of terrestrial vegetation and the relative abundance of different vegetation species. “
Any significant change in the underlying biogeochemistry presents an ecological adaptation challenge, fundamentally destabilizing our natural systems,” Ostberg explained.
The researchers defined a parameter to measure how far apart a future ecosystem under climate change would be from the present state. The parameter encompasses changes in variables such as the vegetation structure (from trees to grass, for example), the carbon stored in the soils and vegetation, and freshwater availability.
“Our indicator of ecosystem change is able to measure the combined effect of changes in many ecosystem processes, instead of looking only at a single process,” Ostberg said.
He hopes the new results can help inform the ongoing negotiations on climate mitigation targets, “as well as planning adaptation to unavoidable change.”