CirrusCloudThinningviaParticulateSeeding

Why It Matters

The warming effect of cirrus clouds contributes significantly to the planet's energy imbalance, potentially accelerating global warming by several tenths of a degree Celsius. If successful, CCT could provide a complementary approach to cooling the planet, reducing the total radiative forcing and buying more time for deep decarbonization efforts, potentially averting some of the most severe climate change impacts. The energy sector, particularly renewables, could see more stable weather patterns, while unforeseen impacts on regional precipitation could harm agriculture. Major challenges include identifying effective, non-toxic seeding agents, precise delivery at high altitudes, and accurately modeling the complex microphysical and radiative effects. Initial small-scale outdoor experiments are projected for the late 2020s, with potential larger-scale pilots by 2045-2050. European research institutions, particularly in Germany and Norway, are prominent in this field. A second-order consequence could be unintended changes in regional precipitation patterns, potentially leading to droughts or floods in areas far from the seeding sites.