World economy set to lose up to 18% GDP from climate change if no action taken, reveals Swiss Re Institute's stress-test analysis

• New Climate Economics Index stress-tests how climate change will impact 48 countries, representing 90% of world economy, and ranks their overall climate resilience
• Expected global GDP impact by 2050 under different scenarios compared to a world without climate change: 18% if no mitigating actions are taken (3.2°C increase); 14% if some mitigating actions are taken (2.6°C increase); 11% if further mitigating actions are taken (2°C increase); 4% if Paris Agreement targets are met (below 2°C increase)
• Economies in Asia would be hardest hit, with China at risk of losing nearly 24% of its GDP in a severe scenario, while the world’s biggest economy, the US, stands to lose close to 10%, and Europe almost 11%

Climate change poses the biggest long-term threat to the global economy. If no mitigating action is taken, global temperatures could rise by more than 3°C and the world economy could shrink by 18% in the next 30 years. But the impact can be lessened if decisive action is taken to meet the targets set in the Paris Agreement, Swiss Re Institute’s new Climate Economics Index shows. This will require more than what is pledged today; public and private sectors will play a crucial role in accelerating the transition to net zero.

Swiss Re Institute has conducted a stress test to examine how 48 economies would be impacted by the ongoing effects of climate change under four different temperature increase scenarios. As global warming makes the impact of weather-related natural disasters more severe, it can lead to substantial income and productivity losses over time. For example, rising sea levels result in loss of land that could have otherwise been used productively and heat stress can lead to crop failures. Emerging economies in equatorial regions would be most affected by rising temperatures.

Major economies could lose roughly 10% of GDP in 30 years

In a severe scenario of a 3.2°C temperature increase, China stands to lose almost one quarter of its GDP (24%) by mid-century. The US, Canada and the UK would all see around a 10% loss. Europe would suffer slightly more (11%), while economies such as Finland or Switzerland are less exposed (6%) than, for example, France or Greece (13%).

Thierry Léger, Group Chief Underwriting Officer and Chairman of Swiss Re Institute, said: “Climate risk affects every society, every company and every individual. By 2050, the world population will grow to almost 10 billion people, especially in regions most impacted by climate change. So, we must act now to mitigate the risks and to reach net-zero targets. Equally, as our recent biodiversity index shows, nature and ecosystem services provide huge economic benefits but are under intense threat. That’s why climate change and biodiversity loss are twin challenges that we need to tackle as a global community to maintain a healthy economy and a sustainable future.“

Climate Economics Index ranks countries’ resilience to climate change

Along with evaluating each country’s expected economic impact from climate risks, Swiss Re Institute also ranked each country on its vulnerability to extreme dry and wet weather conditions. In addition, it looked at the country’s capacity to cope with the effects of climate change. Put together, these findings generate a ranking of countries’ resilience to the impacts of climate change.

The ranking displays a similar view to the GDP impact analysis: Countries most negatively impacted are often the ones with fewest resources to adapt to and mitigate the effects of rising global temperatures. The most vulnerable countries in this context are Malaysia, Thailand, India, the Philippines and Indonesia. Advanced economies in the northern hemisphere are the least vulnerable, including the US, Canada, Switzerland and Germany.

Public and private sectors play a crucial role in accelerating climate action

Given the consequences highlighted in Swiss Re Institute’s analysis, the need for action is indisputable. Coordinated measures by the world’s largest carbon emitters are crucial to meet climate targets. The public and private sectors can facilitate and accelerate the transition, particularly regarding sustainable infrastructure investments that are vital to remain below a 2°C temperature increase. Given the long-term horizon of their liabilities and long-term capital to commit, institutional investors such as pension funds or insurance companies are also ideally positioned to play a strong role.

Jérôme Haegeli, Swiss Re’s Group Chief Economist, said: “Climate change is a systemic risk and can only be addressed globally. So far, too little is being done. Transparency and disclosure of embedded net-zero efforts by governments and the private sector alike are crucial. Only if public and private sectors pull together will the transition to a low-carbon economy be possible. Global cooperation to facilitate financial flows to vulnerable economies is essential. We have an opportunity to correct the course now and construct a world that will be greener, more sustainable and more resilient.

Our analysis shows the benefit of investing in a net-zero economy. For example, adding just 10% to the USD 6.3 trillion of annual global infrastructure investments would limit the average temperature increase to below 2°C. This is just a fraction of the loss in global GDP that we face if we don’t take appropriate action.“

Mitigating climate change requires a whole menu of measures. More carbon- pricing policies combined with incentives for nature-based and carbon-offsetting solutions are needed, as well as international convergence on taxonomy for green and sustainable investments. As part of financial reporting, institutions should regularly disclose how they plan to achieve the Paris Agreement and net-zero emission targets. Re/insurers also play a role in providing risk transfer capacity, risk knowledge and long-term investment, using their understanding of risk to help households, companies and societies mitigate and adapt to climate change.

Climate Economics Index: mid-of-century

The Climate Economics Index looks at which economies would be hardest hit, most exposed and best positioned to adapt to climate risk. It ranks countries based on: Expected economic impact from "chronic" climate risks linked to gradual temperature rises; the degree to which it is vulnerable to extreme weather events and severe hot/wet conditions; and a country's current adaptive capacity.