The concept of sustainable development refers to the idea of ensuring that the needs of the present generation are met without compromising the ability of future generations to meet their own needs. It emphasizes the importance of balancing economic, social, and environmental factors to achieve long-term sustainable growth.

Option 1: Consumption levels. This option focuses on the idea that sustainable development is related to the level of consumption. While consumption patterns do play a role, the concept of sustainable development goes beyond just consumption levels.

Option 2: Exhaustible resources. This option implies that sustainable development is primarily concerned with the management of exhaustible resources such as fossil fuels. While resource management is a component of sustainable development, the concept is broader and encompasses social and economic factors as well.

Option 3: Social equity. This option suggests that sustainable development is related to achieving social equity and justice. While social equity is an important aspect of sustainable development, it is not the only factor.

Option 4: Intergenerational equity. This option correctly identifies intergenerational equity as a key aspect of sustainable development. It emphasizes the importance of ensuring that future generations have access to the same or better resources and quality of life as the current generation. This concept highlights the importance of long-term thinking and responsible decision-making.