Consider the following statements:

1. 36% of India’s districts are classified as ‘overexploited’ or ‘critical’ by the Central Ground Water Authority (CGWA).

2. CGWA was formed under the Environment (Protection) Act.

3. India has the largest area under groundwater irrigation in the world.

Which of the statements given above is/are correct?

The correct option is 2 and 3 only.

Analysis of Statement 1:
According to the Central Ground Water Authority (CGWA) and the assessment reports on groundwater resources in India, the percentage of districts or assessment units classified as 'overexploited' or 'critical' is significantly lower than 36%. Typically, around 15% to 17% of the assessment units are categorized as 'overexploited', and about 5% are classified as 'critical'. Combined, they account for roughly 20% to 22% of the units, which is far less than the 36% stated in the prompt. Therefore, Statement 1 is incorrect.

Analysis of Statement 2:
The Central Ground Water Authority (CGWA) was constituted under Section 3(3) of the Environment (Protection) Act, 1986. Its mandate is to regulate and control groundwater development and management in the country. Therefore, Statement 2 is correct.

Analysis of Statement 3:
India has the largest area under groundwater irrigation in the world. It uses more groundwater than any other country, surpassing even China and the United States. Groundwater accounts for over 60% of the total irrigated area in India. Therefore, Statement 3 is correct.

Since statements 2 and 3 are correct, the correct answer is indeed 2 and 3 only.