The greenhouse effect is a natural process that warms the Earth's surface. When the Sun's energy reaches the Earth's atmosphere, some of it is reflected back to space and the rest is absorbed and re-radiated by greenhouse gases.
Greenhouse Gases (GHGs): Includes Carbon Dioxide, Methane, Nitrous Oxide, and water vapor.
Mechanism: These gases act like the glass walls of a greenhouse, trapping heat in the atmosphere.
Global Warming: While the natural effect is essential for life, human activities (burning fossil fuels, deforestation) have increased GHG concentrations, leading to an "enhanced" greenhouse effect and rising global temperatures.
Impact on the Environment
A. Global Warming
The most direct effect is the steady rise in the Earth's average surface temperature. This leads to Thermal Expansion of the oceans and the rapid melting of polar ice caps and glaciers.
B. Altered Weather Patterns
The energy trapped in the atmosphere disrupts global climate systems:
Extreme Events: Increased frequency and intensity of hurricanes, heatwaves, and droughts.
Shifting Rainfall: Some regions experience catastrophic flooding while others face desertification, affecting global agriculture.
C. Ocean Acidification
Oceans absorb about 30% of the $CO_2$ released into the atmosphere. This reacts with seawater to form carbonic acid, which lowers the pH of the ocean.
Impact: This harms marine organisms like corals and shellfish, which struggle to build their calcium carbonate shells in acidic water.
D. Loss of Biodiversity
Many species cannot adapt or migrate fast enough to keep up with the changing climate. This leads to habitat loss, particularly in sensitive ecosystems like the Arctic and tropical rainforests.
Legal and Global Mitigation
Because the greenhouse effect is a global issue, it is addressed through international treaties and national laws:
The Paris Agreement: Aiming to limit global warming to well below 2°C above pre-industrial levels.
In India: The National Action Plan on Climate Change (NAPCC) and the Environment (Protection) Act, 1986, provide the framework for regulating emissions and promoting renewable energy.
No comments:
Post a Comment