The industrial activity held least responsible for global warming is :

Options

A. steel manufacturing
B. manufacturing of cement
C. Industrial production of urea
D. Electricity generation in thermal power plants

Answer

To solve the question regarding which industrial activity is held least responsible for global warming, we will analyze each option provided:

1. **Steel Manufacturing**: This process is known to emit significant amounts of carbon dioxide (CO2) and other greenhouse gases during the production of steel. Therefore, it is highly responsible for global warming.

2. **Manufacturing of Cement**: Cement production also contributes heavily to CO2 emissions. The chemical reactions involved in the production of cement release a considerable amount of greenhouse gases. Hence, this activity is also significantly responsible for global warming.

3. **Industrial Production of Urea**: The production of urea involves the consumption of ammonia (NH3) and carbon dioxide (CO2). Since this process consumes CO2 rather than emitting it, it is considered to have a lesser impact on global warming compared to the other options.

4. **Electricity Generation in Thermal Plants**: Thermal power plants primarily burn fossil fuels, which results in the emission of large quantities of CO2 and other greenhouse gases. This makes electricity generation in thermal plants a major contributor to global warming.

Based on the analysis above, the industrial activity held least responsible for global warming is:

**Answer: Industrial production of urea.**