What do Carbon Offsets aim to achieve in LEED projects?

Carbon offsets are specifically designed to mitigate greenhouse gas emissions. In the context of LEED projects, purchasing carbon offsets allows a project to compensate for its own emissions by investing in projects that reduce or sequester emissions elsewhere. This can include initiatives such as reforestation, renewable energy projects, or energy efficiency programs that reduce emissions in the atmosphere.

Choosing carbon offsets aligns with LEED's broader goal of promoting sustainable practices and reducing the overall carbon footprint of buildings and communities. By addressing greenhouse gas emissions, LEED projects contribute to the global effort to combat climate change, making this the correct answer.

The other options relate to different aspects of sustainability but do not specifically pertain to the function of carbon offsets. While reducing onsite energy usage, enhancing indoor air quality, and improving water efficiency are important for sustainable building practices, they do not directly connect to the concept of carbon offsetting.