Is water (water) on this earth as much as it was centuries a
Is water (water) on this earth as much as it was centuries ago, or has now reduced?
Total Amount of Water on Earth:
✅ The total volume of water on Earth, approximately 1.386 billion cubic kilometers, remains nearly constant. The water cycle (evaporation, precipitation, runoff, and groundwater recharge) ensures water changes forms—oceans to clouds to rain to rivers and back—but the overall quantity doesn’t significantly change. It’s roughly the same as it was millions of years ago.
Why Does It Feel Like Water Is “Decreasing”?
❌ It’s not the total water but the availability of usable freshwater that’s decreasing.
• Reasons:
1. Limited Freshwater: Only 2.5-3 percent of Earth’s water is freshwater, and about 70percent of that is locked in glaciers and ice caps. Less than 1 percent (rivers, lakes, groundwater) is available for human use.
2. Groundwater Overexploitation: In countries like India, groundwater is being extracted rapidly for agriculture and urban use. For example, groundwater levels in India drop by 1-2 meters annually in some regions.
3. Pollution: Rivers (e.g., Ganga, Yamuna) and lakes are contaminated by industrial waste, chemicals, and plastics, reducing clean water availability.
4. Climate Change: Changing rainfall patterns, increasing droughts, and melting glaciers (Himalayan glaciers are shrinking by 20-30 percent ) disrupt local water availability.
Conclusion:
• Is the total amount of water the same? ✅ Yes, it’s nearly unchanged.
• Is usable drinking water decreasing? ✅ Yes, rapidly.
• Why? ❗ Pollution, overextraction, climate change, and population growth.
• Solutions? ✅ Water conservation (e.g., rainwater harvesting), groundwater recharge, pollution control, and sustainable practices like drip irrigation.
Additional Points:
• In India, per capita water availability has dropped from 5,177 cubic meters in 1951 to about 1,486 cubic meters in 2021 (Ministry of Jal Shakti), due to population growth and overuse.
• The World Bank warns that by 2030, India could face a severe water crisis without urgent action.
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