McKinsey analyzes the natural risks and socio-economic impacts of climate change
On January 15, 2020, the McKinsey Global Institute (McKinsey Global Institute) released a report entitled "Climate risk and response: natural disasters and socio-economic impacts" (Climate Risk and Response:Physical Hazards and Socioeconomic Impacts), which analyzes how the changing climate will affect the global socio-economic system over the next 30 years.

The report links climate models to economic forecasts and studies nine cases that illustrate exposure to extreme climate change and near thresholds. The report also analyzes the potential socio-economic impacts of 105 countries through geospatial assessments.
The main conclusions include:
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Seven remarkable characteristics of natural risks of climate change
The natural risks caused by climate change already exist and are increasing, showing seven distinct characteristics:
(1) growth: in the nine cases studied, the natural risk level of climate change will increase by 2030 and 2050. By 2050, the socio-economic impact will be about 2 to 20 times higher than it is today. Even if some countries reap some benefits (for example, agricultural production is expected to increase in countries such as Canada), an overall analysis of countries around the world shows that the natural risks of climate change will increase.
(2) Spatial differentiation: climate hazards often occur locally. Therefore, there is a need to understand the direct impact of the natural risks of climate change in a geographical context, and there are differences between and within countries.
(3) unsteady: as global warming continues, the natural risks of climate change are constantly changing or unsteady. Due to the physical inertia of the geophysical system, further warming in the next 10 years will be "locked". Only by achieving net zero greenhouse gas emissions can the risk of further warming be prevented. In addition, considering the thermal inertia of the earth system, a certain degree of warming may occur after reaching net zero emission.
(4) Nonlinearity: when the climate change disaster exceeds the threshold, its socio-economic impact is likely to spread in a non-linear manner, and the affected natural, man-made or ecosystem will not function properly, collapse or even stop functioning completely.
(v) systemic: although the direct impact of climate change is local, it can have a knock-on effect throughout the region and sectors through interrelated socio-economic and financial systems.
(VI) regressive: in the case study, the poorest communities and populations are usually the most vulnerable. Climate risks can cause spatial differences, benefiting some areas while hurting others.
(VII) inadequate preparedness: although companies and communities have been working to reduce climate risks, the pace and scale of adaptation still need to be significantly increased to cope with rising levels of natural climate risks. The adaptation process can lead to rising costs and difficult choices, including whether to invest in strengthening or relocating people and assets.
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Climate change has had a substantial impact in all regions of the world
Since 1880, the temperature of the earth has risen by an average of about 1.1 ℃. Satellite observations and observations from hundreds of thousands of independent weather stations around the world have confirmed this, and the rapid reduction of the earth's surface ice sheet provides further evidence. The rate of warming is at least an order of magnitude faster than the paleoclimate record of the past 65 million years.
The number and size of the affected areas are increasing. It will inevitably heat up further in the next 10 years and probably after that. With the increase of global average temperature, climate models show that global climate disasters are increasing. Further warming will continue to increase the frequency and severity of climate disasters in the short term, and further aggravate long-term climate disasters.
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Social economy affects non-linear growth and produces a chain reaction
Climate change has had a measurable impact on the social economy from five aspects: livability and workability, food system, physical assets, infrastructure services and natural capital. the results of the analysis of a series of socio-economic impacts caused by climate disasters show that the actual risks brought by climate change are increasing in a non-linear manner. The natural effects of climate change spread in various regions, and climate disasters and their impacts are becoming more and more intense in the region. To date the increase in the direct impact of climate disasters is mainly due to increased exposure to disasters rather than an increase in the average intensity of disasters. In the future, the intensification of disasters may have a greater impact.
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The global socio-economic impact is likely to be great
The report assesses possible climate natural disasters in 105 countries. By 2030, it is expected that the human, material and natural capital of 105 countries will be affected by at least one major type of disaster. The intensification of climate disasters could kill millions of people and put trillions of dollars of economic activity and global natural capital at risk. Increased cross-regional climate hazards will bring hitherto unaffected areas into new risk areas, including:
The main results are as follows: (1) by 2050, under the typical concentration path (RCP 8.5) scenario, the population of areas with fatal heat wave events will increase from zero to 700-1.2 billion. As a result of exposure to extreme high temperatures, the average proportion of annual loss of effective outdoor working time worldwide is likely to increase from 10% at present to 10% to 15% by 2030 and to 15% to 20% by 2050.
(II) the food system is expected to show a trend of increasing volatility in global agricultural production. The likelihood of a 10% or more annual reduction in wheat, corn, soybeans and rice is expected to increase from 6% to 20% by 2050. In a given year, the likelihood of an increase of 10% or more in annual production is expected to increase from 1% to 6%.
(III) assets may be damaged or infrastructure services may be disrupted by various disasters, including floods, forest fires, hurricanes and heat waves. It is estimated that the capital damage caused by river floods is likely to double its current level by 2030 and quadruple by 2050.
(4) in some parts of the world, biological communities may change. Compared with 1901-1925, about 25% of the land has undergone a change in climate type. By 2050, that number is expected to increase to 45%.
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Countries with lower per capita GDP usually face greater risks.
Although all countries are affected by climate change, the poorest countries may face more threats. Because the climate of these countries tends to be close to dangerous thresholds and rely more on outdoor work and natural capital, there is a lack of financial means for rapid adaptation. The workability index (the proportion of annual effective outdoor working hours lost due to extreme high temperatures and extreme precipitation) shows that the average risk of the top four countries in terms of GDP per capita increased by about 1% by 1.3% by 2050, while the average risk faced by the last one by 10%. Fatal heatwave events have little correlation with per capita GDP, but the worst affected countries (such as Bangladesh, India and Pakistan) have relatively low levels of GDP per capita.
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Decision maker's suggestion
In the face of these challenges, decision makers and business leaders will need to use the right tools, analysis, processes and governance to correctly assess climate risks, adapt to unchangeable risks, and reduce carbon emissions to avoid further risk accumulation.
(1) incorporate climate risk into decision-making. Decisions need to take into account the natural risks and economic and social impacts of climate change. For companies, this means considering climate factors in capital allocation, product or service development, and supply chain management. For cities, paying attention to climate will become the key to urban planning decision-making. In addition, comprehensive risk management strategies need to be assessed, including transitional and liability risks, as well as the interaction betwee




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