[Feature Request] Add Global Comparison Page (global.html)

[Riya-Kharade]

💡 The Problem

EcoPulse focuses on city-level data but lacks country-level comparison.

---

🚀 Proposed Solution

Create global.html with:

• 🌎 Country selector
• 📊 Rank top polluted countries
• 📈 Interactive comparison table
• 🔄 Sort functionality

---

🛠 Implementation

• Tailwind CSS table layout
• Vanilla JS sorting logic
• Static global pollution dataset

---

🎯 Impact

• Adds global perspective
• Makes platform look UN-style
• Enhances analytical depth

Assign this issue to me under ECWOC'26