Firing millions of tons of diamond dust into the sky could save our planet

Scientists propose injecting 5 million tons of diamond dust into the stratosphere yearly to cool the planet by 1.6°C, potentially mitigating severe climate impacts. This stratospheric aerosol injection method could buy time for emission reduction and carbon removal efforts. While possibly safer than sulfur-based alternatives, it would cost an estimated $200 trillion through 2100. Researchers are also exploring cheaper options like calcite particles. The proposal reflects growing interest in geoengineering to address climate change, despite uncertainties and controversies.