Sure! Here is a concise and well-structured note on **Global Warming** in English, designed specifically for students to use in exams or assignments.
## **Topic: Global Warming**
### **1. Definition**
Global Warming refers to the long-term increase in the average temperature of Earth’s atmosphere and oceans. It is a major aspect of climate change and is primarily caused by the buildup of greenhouse gases in the atmosphere.
### **2. The Greenhouse Effect**
The Earth stays warm because of the “Greenhouse Effect.” Gases like **Carbon Dioxide (CO_2)**, **Methane (CH_4)**, and **Water Vapor** trap the sun’s heat. While this is natural, human activities have increased these gases to dangerous levels, leading to excessive heating.
### **3. Major Causes**
* **Deforestation:** Cutting down forests means fewer trees to absorb CO_2, leading to higher concentrations in the air.
* **Burning of Fossil Fuels:** Using coal, oil, and gas for electricity and transport releases massive amounts of CO_2.
* **Industrial Emissions:** Factories release harmful chemicals and smoke into the atmosphere.
* **Agriculture:** Certain farming practices and livestock (like cows) release large amounts of Methane.
### **4. Impact of Global Warming**
The consequences of a warming planet are severe:
1. **Rising Sea Levels:** Polar ice caps and glaciers are melting, causing oceans to rise and threatening coastal cities.
2. **Extreme Weather:** There is an increase in the frequency of hurricanes, floods, droughts, and heatwaves.
3. **Loss of Biodiversity:** Many species are losing their habitats and face the risk of extinction (e.g., Polar bears and Coral reefs).
4. **Health Risks:** Higher temperatures contribute to the spread of diseases and heat-related illnesses.
### **5. Solutions and Prevention**
* **Reforestation:** Planting more trees to act as “carbon sinks.”
* **Switch to Renewable Energy:** Using Solar, Wind, and Hydro power instead of coal and petrol.
* **The 3 Rs:** **Reduce** consumption, **Reuse** items, and **Recycle** waste to save energy.
* **Energy Conservation:** Turning off lights when not in use and using energy-efficient appliances (like LED bulbs).
### **Summary Table for Quick Revision**
| Feature | Details |
| :— | :— |
| **Primary Gas** | Carbon Dioxide (CO_2) |
| **Main Human Cause** | Burning Fossil Fuels & Deforestation |
| **Visible Sign** | Melting Glaciers / Rising Sea Levels |
| **Global Goal** | Limit warming to 1.5^circtext{C} |
> **Study Tip:** When writing an answer, always mention that Global Warming is a **global issue** that requires international cooperation, such as the *Paris Agreement*.
>
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