To combat climate change effectively, the international community needs to swiftly transition to renewable energy and enhance carbon removal technologies, which extract greenhouse gases from the atmosphere. A new study published in Communications Sustainability argues that the United States should focus on renewable energy investment rather than costly direct air capture (DAC) programs.
The research indicates that, by 2050, investments in wind and solar energy will yield greater climate and public health benefits across nearly all U.S. regions compared to DAC. Lead author Jonathan J. Buonocore emphasizes that $100 million invested in renewable sources would reduce more CO2 emissions than the same amount spent on DAC, which also has significant air pollution reduction benefits.
Renewable energy addresses the climate crisis by preventing new carbon emissions, while DAC aims to reduce existing atmospheric CO2. The Intergovernmental Panel on Climate Change has identified both approaches as necessary to stabilize global temperatures affected by CO2.
However, DAC technology is still developing and remains expensive and energy-intensive. The researchers modeled the benefits of each strategy and found that DAC could only outperform renewable energy under highly optimistic scenarios with improved efficiency and reduced costs. Currently, DAC is projected to create more greenhouse gas and air pollution damage than it offsets by 2050, making the need for prioritizing renewable energy investments clear.
While the study acknowledges the potential role of DAC in addressing leftover carbon emissions, it advocates for prioritizing renewable energy to effectively reduce carbon emissions in the short term.
