Installing concrete sidewalks and parking areas will increase the quantity of the rainwater that is discharged from a site. Rainwater is the water that falls as precipitation on a site. Rainwater discharge is the amount of rainwater that leaves a site as surface runoff or subsurface flow. Rainwater discharge can affect the quantity and quality of water resources downstream by causing erosion, flooding, sedimentation, pollution, and habitat loss. Concrete sidewalks and parking areas are examples ofimpervious surfaces that prevent rainwater from infiltrating intothe soil and increase rainwater discharge by creating more runoff1 . References: LEED v4 Green Associate Candidate Handbook1, EPA's Stormwater Management

Systems thinking is a principle that is part of the integrated process, which is a collaborative and holistic approach to green building design, construction, and operation. Systems thinking involves understanding the interrelationships and interactions among the various components of a system, such as the building, its occupants, its site, its climate, and its energy sources. Systems thinking helps to identify synergies, optimize performance, avoid unintendedconsequences, and create multiple benefits for the project13. References:
LEED v4 Green Associate Candidate Handbook1, LEED v4 BD+C Reference Guide3

Climate change is weighted the most in the LEED rating systems because it is considered the most urgent and significant environmental challenge facing humanity. Climate change is caused by the accumulation of greenhouse gases in the atmosphere, which trap heat and alter the global climate patterns. Climate change can have severe consequences for human health, biodiversity, water resources, food security, and social equity.
LEED projects can help mitigate climate change by reducing greenhouse gas emissions from building operations and materials, as well as enhancing resilience and adaptation to climate impacts. The LEED impact categories andpoint allocation process assigns 35% of the total points to climatechange. References: LEED v4 Impact Category and Point Allocation Process Overview2; LEED v4 BD+C Reference Guide, Introduction, page 9

Occupancy sensors are devices that detect the presence or absence of people in a space and automatically turn the lights on or off accordingly. By installing occupancy sensors for the building's lighting system, projects can achieve two benefits: improving the indoor environmental quality (IEQ) and reducing the energy consumption. Occupancy sensors can enhance the IEQ by providing lighting control for individual spaces, allowing occupants to adjust the light levels to their preferences and needs. Occupancy sensors can also save energy by avoiding unnecessary lighting when spaces are unoccupied, thus lowering the electricity demand and greenhouse gas emissions. References: LEED v4 Reference Guide for Building Design and Construction, p. 507 1; LEED v4 Reference Guide for Building Operations and Maintenance, p. 241 1

Implementing a stormwater pollution prevention plan during construction can help projects meet on-site sustainability goals. This plan outlines measures to control runoff and prevent soil erosion, which can carry pollutants into nearby water bodies. By managing stormwater on-site, projects can protect local water quality while also recharging groundwater supplies. References: LEED Green Associate Candidate Handbook, U.S.
Green Building Council resources