| The United Nations is pushing countries to meet the Paris Agreement’s most ambitious target: limiting global warming to 1.5 degrees Celsius — the threshold for avoiding the worst effects of climate change. But the likelihood of overshooting that threshold increases every day, Chelsea Harvey writes. Worldwide temperatures have already surged above the 1.5-degree limit for short periods, and emissions projections over the next six years aren’t compatible with the goal. Scientists have become more candid in recent years about the impending risk. A 2022 U.N. report, for example, warned that if countries didn’t do more to reduce emissions, there would be “no credible pathway” to 1.5 degrees. But experts are split on how that should affect public messaging from world leaders. Some researchers say it’s time for leaders to prepare for an overshoot, acknowledging the possibility of exceeding 1.5 degrees while minimizing the severity and duration. Sticking to a 1.5-degree limit may require deploying “negative emissions” technologies — such as carbon removal — that are so far unproven at the massive scale necessary. Policymakers “would need to plan for and to communicate that the world needs to reach net-negative CO2 emissions after reaching net-zero around 2050,” Oliver Geden, a climate policy expert at the German Institute for International and Security Affairs, said in an email to Chelsea. But others argue the simpler message is best: Strive for 1.5 degrees, period, because avoiding even a fraction of a degree of warming matters. Meeting the target is also still technically possible — though it would require an unprecedented overhaul of the global economy to cut planet-warming emissions by more than 40 percent by 2030. “You need to do the same things whether you're aiming for 1.5 or for 2 [degrees],” said Laura Pereira, a researcher at the University of the Witwatersrand in South Africa. “It’s just that if you act now and do it rapidly enough, you can do 1.5.” Meanwhile, in Washington So far, climate deals haven’t been able to contain the world’s thirst for fossil fuels, the main drivers of global warming. The United States, the world’s second-largest emitter of greenhouse gases, is producing more crude oil than ever. The Biden administration, however, has set ambitious goals to transition away from fossil fuels and toward renewable energy. It is also partly relying on nascent technologies to hit net-zero emissions by midcentury — including “clean” hydrogen, which is touted as a way to cut climate pollution from energy-intensive industries like steel production But this week, a Department of Energy advisory panel offered what Secretary Jennifer Granholm called a “sobering” analysis of the near-term prospects for the fuel, Christian Robles and Carlos Anchondo write. The National Petroleum Council cautioned that the clean hydrogen industry is not growing fast enough to meet climate goals. Hydrogen is “one of those sectors and technologies that is not on track” to meet net-zero goals, Deputy Energy Secretary David Turk said Tuesday. But that “doesn’t mean we’re not making progress.”
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