Consider the following heavy industries:

1. Fertilizer plants

2. Oil refineries

3. Steel plants

Green hydrogen is expected to play a significant role in decarbonizing how many of the above industries?

Among the following crops, which one is the most important anthropogenic source of both methane and nitrous oxide ?

"System of Rice Intensification" of cultivation, in which alternate wetting and drying of rice fields is practised, results in :

1. Reduced seed requirement

2. Reduced methane production

3. Reduced electricity consumption

Select the correct answer using the code given below :

In the context of WHO Air Quality Guidelines, consider the following statements :

1. The 24-hour mean of PM_2.5 should not exceed 15 μg/m³ and annual mean of PM_2.5 should not exceed 5 μg/m³.

2. In a year, the highest levels of ozone pollution occur during the periods of inclement weather.

3. PM₁₀ can penetrate the lung barrier and enter the bloodstream.

4. Excessive ozone in the air can trigger asthma.

Which of the statements given above are correct?