Weather manipulation, also known as **weather modification**, involves techniques used to artificially influence atmospheric conditions. Here are the main methods:
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### 1. **Cloud Seeding**
* **Purpose**: Enhance precipitation (rain or snow), dissipate fog, or reduce hail.
* **How it works**: Chemicals like **silver iodide**, **potassium iodide**, or **dry ice (CO₂)** are dispersed into clouds to encourage condensation and cloud droplet formation.
* **Common Uses**:
* Increasing rainfall in drought-prone areas.
* Reducing hail damage in agriculture.
* Improving visibility near airports.
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### 2. **Fog Dispersal**
* **Purpose**: Clear fog to improve visibility, mainly at airports.
* **How it works**: Dry ice or propane burners are used to cool the air or condense fog droplets into larger droplets that fall to the ground.
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### 3. **Hail Suppression**
* **Purpose**: Reduce the size or formation of hailstones.
* **How it works**: Similar to cloud seeding but timed to interfere with hailstone development in cumulonimbus clouds.
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### 4. **Hurricane Modification (Experimental)**
* **Purpose**: Weaken tropical cyclones or change their path.
* **How it works**: Theoretical approaches include:
* Cooling ocean water (e.g., using aerosols or underwater bubbles).
* Dispersing soot or cloud-brightening substances.
* **Status**: Not currently practical or proven effective.
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### 5. **Geoengineering (Climate Engineering)**
* **Purpose**: Long-term alteration of Earth's climate to counteract global warming.
* **Techniques**:
* **Solar Radiation Management (SRM)**: Reflecting sunlight using aerosols (e.g., sulfur dioxide in the stratosphere).
* **Carbon Dioxide Removal (CDR)**: Techniques to remove CO₂ from the atmosphere (e.g., afforestation, ocean fertilization).
* **Controversial** and subject to ethical and environmental debate.
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