Uneven Global Temperature Rise: Current and Projected Trends

Many scientific authorities, such as the Intergovernmental Panel on Climate Change (IPCC), often discuss the need to limit planetary warming to 2°C above pre-industrial levels. However, this warming is not distributed evenly across the globe due to factors such as geography, weather patterns, ocean currents, and human activities. The three maps below, created in partnership with the National Public Utilities Council and using new and updated data from Berkeley Earth, visualize the global temperature rise by country.

Current State of Warming (2022)

The map below (Figure A) shows the warming relative to each country’s average 1850-1900 temperatures. As of 2022, the average national warming (excluding oceans) is already 1.81°C above those numbers. Mongolia has experienced the most significant increase at 2.54°C, while Bangladesh has the least at 1.1°C.

Warming is generally more accelerated in the Global North, a phenomenon driven by Arctic amplification. Arctic amplification refers to the disproportionate heating experienced in the Arctic compared to the rest of the planet. This amplification is fueled by multiple feedback loops, including decreased albedo as ice cover diminishes, leading to further absorption of heat and exacerbating the warming effect. This pattern is evident in both current observations and climate models projecting accelerated warming in countries like Russia and Canada through 2100.

Projected Warming in 2050

The map below (Figure B) presents the country-level warming projections for 2050 based on the IPCC’s “middle-of-the-road” scenario, titled Shared Socioeconomic Pathway (SSP) 2-4.5. Under this scenario, average national warming is projected to be 2.75°C above 1850-1900 temperatures by 2050. Mongolia again shows the most substantial warming at 3.76°C, while New Zealand is projected to experience the mildest warming at 2.02°C.

According to the IPCC’s latest assessment report, these temperature increases are likely to bring about several risks:

• More frequent and intense extreme weather events, including heavy precipitation, flooding, and cyclones.
• High risks of biodiversity loss across nearly all ecosystems, including terrestrial, freshwater, coastal, and marine ecosystems.
• Accelerated sea level rise threatening coastal cities and leading to mass displacement.

Projected Warming in 2100

The map below (Figure C) provides projections for 2100 under the same SSP2-4.5 scenario, showing an average national warming of 3.80°C. More than 55 countries are expected to experience warming above 4°C compared to their 1850-1900 averages, with nearly 100 countries surpassing 3.5°C.

The impacts of this level of warming, according to the IPCC, include:

• High extinction risks for 3-39% of terrestrial species.
• Significant water scarcity affecting cities, farms, and hydro plants, with about 10% of the world’s land area experiencing both exceptionally high and low river flows.
• Substantial threats to global food production and accessibility due to droughts, floods, and heatwaves, eroding food security and impacting nutritional stability.

Conclusion

These visualizations highlight the uneven distribution of global warming and the severe impacts that different regions will face if current trends continue. This disparity in temperature rise underscores the importance of localized climate strategies. For instance, countries in the Global North, such as Russia and Canada, are expected to experience accelerated warming due to Arctic amplification. This phenomenon not only affects local ecosystems and communities but also has global repercussions by altering weather patterns and accelerating sea level rise.

Understanding these nuances is crucial for implementing effective mitigation and adaptation strategies worldwide. Mitigation efforts, such as reducing greenhouse gas emissions, need to be tailored to the specific needs and circumstances of each region. For example, regions projected to experience the highest temperature increases should prioritize renewable energy sources and energy efficiency measures to reduce their carbon footprint. Meanwhile, adaptation strategies must focus on enhancing the resilience of communities and ecosystems to withstand the impacts of warming that is already inevitable.

Immediate and substantial efforts are necessary to address these challenges and limit future warming. Governments, businesses, and individuals all have roles to play in this global endeavor. Policymakers must enact and enforce regulations that limit emissions and promote sustainable practices. Industries should invest in clean technologies and sustainable operations. Individuals can contribute by adopting environmentally friendly habits and supporting policies and initiatives aimed at combating climate change.

If the international community fails to act decisively, the consequences will be dire. Higher temperatures will lead to more frequent and intense extreme weather events, loss of biodiversity, and significant disruptions to water and food security. The IPCC’s projections for 2050 and 2100 make it clear that the window for action is closing rapidly. The projected impacts on water scarcity, food production, and biodiversity loss are stark reminders of what is at stake.

In conclusion, the maps provided by the National Public Utilities Council and Berkeley Earth offer a sobering glimpse into our future under current climate trajectories. They serve as a call to action for all sectors of society to commit to meaningful climate action. By understanding and addressing the uneven distribution of global warming, we can develop targeted strategies that protect both our planet and the diverse communities that inhabit it. The time to act is now, for the sake of future generations and the health of our planet.