Diamond Dust: A Sparkling Solution to Global Warming?

Scientists propose injecting 5 million tons of diamond dust into the stratosphere each year to cool Earth by 1.6°C over 45 years, as detailed in Geophysical Research Letters. Unlike sulfur particles, diamonds are chemically inert, preventing acid rain and ozone harm. However, the eye-watering $200 trillion cost dwarfs traditional methods by 2,400 times. While the idea sparkles with potential, financing this gemstone-grade geoengineering remains a formidable challenge.