Consider the following statements: Developed countries can support developing countries' transition to sustainable human development by<br/>1. making clean energy sources available at low cost<br/>2. providing loans for improving their public transport at nominal interest rates<br/>3. encouraging them to change their production and consumption patterns<br/><br/>Which of the statements given above is/are correct?

The question addresses the role of developed countries in supporting developing countries' transition to sustainable human development, particularly in the context of environmental sustainability and clean energy.

1. Making clean energy sources available at low cost: This statement is correct. Developed countries have the technological and financial resources to provide clean energy solutions, such as solar, wind, and hydroelectric power, at lower costs. This support can significantly aid developing countries in reducing their reliance on fossil fuels and transitioning to sustainable energy sources.

2. Providing loans for improving their public transport at nominal interest rates: This statement is also correct. Access to affordable loans can enable developing countries to invest in sustainable public transport systems, which are crucial for reducing carbon emissions and improving urban mobility. However, the statement does not explicitly mention the sustainability aspect, which is essential for the context of the question.

3. Encouraging them to change their production and consumption patterns: This statement is somewhat misleading. While developed countries can encourage changes in production and consumption patterns through various means (like trade agreements, capacity building, etc.), the effectiveness of such encouragement can vary significantly. It is not as direct as the first two statements, which involve tangible support mechanisms.

Given the analysis, the most straightforward and correct answer is (a) 1 only, as it directly addresses a clear method of support that developed countries can provide to facilitate sustainable human development in developing nations.