The climate clock is ticking. Scientists say that to avert the worst effects of the climate crisis, we need to keep the increase in average global temperatures under 1.5 degrees Celsius, as compared to preindustrial levels. And we need to act fast, slashing human-caused greenhouse emissions by almost half by 2030 and reaching net zero emissions by midcentury.
However, many of those same experts say that we are on a trajectory to overshoot these marks, especially if we rely solely on avoiding emissions. The United Nations authority on global-warming science, the Intergovernmental Panel on Climate Change, says that all its models for meeting the 1.5 threshold rely, to some extent, on technologies that actually take carbon out of the atmosphere—an approach called CDR, or carbon dioxide removal.
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