New research highlights how the world’s poorest nations, particularly those in tropical regions, stand to be the last to experience the benefits of global efforts to reach net zero greenhouse gas emissions, underscoring persistent inequalities in the climate crisis.
The study, conducted by a team of Australian climate scientists led by Dr. Andrew King at the University of Melbourne, examined temperature changes projected under scenarios in which global emissions achieve net zero, a central goal of the 2015 Paris Agreement. Using multiple climate models, the researchers overlaid temperature projections with countries’ gross domestic product data to assess disparities in warming exposure.
Their findings indicate that tropical regions, which have already faced larger temperature increases relative to their historical ranges compared to higher latitude areas in wealthier countries, are likely to continue experiencing disproportionate warming even after net zero targets are met. King noted that the inequality in temperature impact would persist indefinitely under net zero, with some reversal potentially taking decades if global emissions went below zero through carbon removal strategies.
“Regions that have contributed least to greenhouse gas emissions are suffering the most from warming,” King explained. He emphasized the importance of reaching net zero emissions as soon as possible to reduce long-term warming, noting that the accumulated carbon already in the atmosphere will continue to drive temperature increases for centuries.
Tropical ecosystems, including sensitive coral reefs, are especially vulnerable given their adaptation to narrower temperature ranges. Such ecosystems are projected to endure extended stress as the planet transitions toward net zero.
The release of this study coincided with a report by the United Nations refugee agency addressing how climate change exacerbates the risk of statelessness. The report, produced in partnership with the Peter McMullin Centre on Statelessness, warned that extreme climate impacts—such as sea level rise and natural disasters—threaten the continuity of statehood in vulnerable areas, notably Pacific island nations.
An estimated 4.5 million people are currently stateless, though the actual number is likely higher due to underreporting. The report highlighted that climate-driven displacement could increase statelessness by leaving individuals and families without recognized citizenship, further marginalizing already vulnerable populations.
Associate Professor Radha Govil from the University of Melbourne, a co-author of the statelessness report, pointed out a strong correlation between regions most impacted by climate change and the prevalence of stateless populations. The report urged governments to implement measures such as digitizing citizenship records to preserve legal identities and ensuring children born in the aftermath of climate disasters acquire citizenship, particularly addressing gender disparities where mothers may lack equal rights to confer nationality.
Govil described these recommendations as practical and necessary steps to mitigate the emerging risk of climate-induced statelessness. “They can save lives and help manage this looming humanitarian challenge,” she said.
Together, these studies emphasize that while global efforts to curb emissions are crucial, the unequal consequences of climate change on poorer nations require targeted policies and international cooperation to address persistent environmental and social inequalities.