Summary about climate change

Summary of climate change impacts
April 14, 2015 – 11:36 am

Africa_impactsI commented that I’d like to understand the actual impacts of anthropogenic climate change better than I currently do. It’s one thing to understand that if we continue to increase our emissions, we’ll continue to warm, sea level will rise, polar ice will melt, and the hydrological cycle will intensify; it’s another to understand quite what impact these changes will actually have.

VTG, quite rightly, ; impact studies are inherently regional, which introduces large uncertainties. It also seems to make communicating this quite difficult; there are many regions and multiple impacts per region. Therefore, there’s isn’t a small set of nice soundbites that can be used to illustrate these impacts; you really do need to delve into them in quite some detail.

So, I thought I would try and do a bit of that here.Europe_impacts The table in the SPM recommended by VTG is actually pretty detailed; it includes a range of impacts for each region, the confidence in each projection, the climate drivers, the risks for different timeframes, and the potential for adaptation (being WGII, this report focused mainly on adaptation). What I thought I would do below is reproduce the part of the table for each region and highlight one impacts, for each region, for which there is high confidence.

Africa :

  • Reduced crop productivity associated with heat and drought stress, with strong adverse effects on regional, national, and household livelihood and food security, also given increased pest and disease damage and flood impacts on food system infrastructure. Under a high-emission pathway, the long-term risk is very high with little potential for adaptation.


  • Increased water restrictions.Asia_impacts Significant reduction in water availability from river abstraction and from groundwater resources, combined with increased water demand and with reduced water drainage and runoff as a result of increased evaporative demand, particularly in southern Europe. Risk is medium-to-high with some potential for adaptation.


  • Increased risk of heat-related mortality. Under a high-emission pathway, the long-term risk is very high with little potential for adaptation.


  • Increased frequency and intensity of flood damage to infrastructure and settlements in Australia and New Zealand.CentralAmerica_impacts The long-term risk is medium with potential for adaptation.

North America:

  • Wildfire-induced loss of ecosystem integrity, property loss, human morbidity, and mortality as a result of increased drying trend and temperature trend. Under a high-emission pathway, the long-term risk is very high with not much potential for adaptation.

Central and South America:

  • Spread of vector-borne diseases in altitude and latitude. In the medium-term this carries medium risk with potential for adaptation. No long-term risk information.

Polar regions:

  • Risks for the health and well-being of Arctic residents, resulting from injuries and illness from the changing physical environment, food insecurity, lack of reliable and safe drinking water, and damage to infrastructure, including infrastructure in permafrost regions. Long-term risk is high, but with potential for adaptation.
PolarRegions_impacts SmallIslands_impacts
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