What are the historical developments and current techniques used in geoengineering for weather modification?

Geoengineering has a documented history dating back to 1947 with Project Cirrus, marking the first scientific attempt to modify hurricanes. Major milestones include Project Skywalker (1962) for cloud seeding, Project Storm Fury (1962-1983) for hurricane modification experiments, and Operation Popeye during Vietnam to extend monsoons. Current techniques involve sophisticated methods like chemical ice nucleation and cloud seeding, which create surface cooling effects by converting liquid precipitation into frozen precipitation. Countries like China have openly implemented these technologies to create artificial snowstorms, demonstrating that weather modification has evolved from experimental projects to practical applications used by governments worldwide.