Fired Bricks: CO₂ Emission and Food Insecurity.

Area of Science:

• Environmental Science
• Agricultural Science
• Climate Science

Background:

• Traditional brick manufacturing, a practice dating back to the Indus Valley Civilization, relies on removing agriculturally productive topsoil.
• This process not only degrades fertile land but also releases greenhouse gases, contributing to atmospheric pollution.
• The extensive use of land for brick kilns in India raises concerns about environmental sustainability and food security.

Purpose of the Study:

• To quantify the annual carbon dioxide (CO2) emissions resulting from brick making in India.
• To assess the extent of agricultural production loss due to land used for brick kilns.
• To understand the dual impact of brick manufacturing on climate change and food security.

Main Methods:

• Estimation of annual CO2 emissions based on the production of approximately 250 billion bricks per year.
• Calculation of soil organic carbon loss during the firing process and associated emissions from coal combustion.
• Assessment of potential reduction in agronomic yield on land impacted by brick kilns.

Main Results:

• Brick kilns in India occupy 0.7 million hectares of agricultural land.
• The production of 250 billion bricks annually results in 5.58-6.12 Tg of soil organic carbon loss (20.48-22.46 Tg CO2).
• Total annual CO2 emissions from brick making range from 40.65 to 42.64 Tg, with potential agronomic yield reduction of 60-90%.

Conclusions:

• Topsoil removal for brick making significantly degrades soil quality, exacerbating food and nutritional insecurity in India.
• The brick manufacturing process is a major contributor to atmospheric CO2 emissions, increasing climate change risks.
• Sustainable alternatives to traditional brick making are crucial to mitigate environmental degradation and ensure food security.