The Earth's climate is changing, and 97 percent of climate scientists agree that it is likely due to human activities. So where does that leave us and the rest of the building industry?
Buildings account for more than one-quarter of all greenhouse gas emissions (GHGs), according to the Global Alliance for Buildings and Construction. Add in other infrastructure and activities, such as transportation, that are associated with buildings, and that number jumps.
By building green, we can reduce the impact our buildings have on contributing to climate change, while also building resilience into our homes and communities.
LEED vs climate change
One of the goals that guided the development of LEED v4 was reversing a LEED building’s contribution to global climate change. High-performing green buildings, particularly LEED-certified buildings, play a key role in reducing the negative climate impacts of the built environment. For this reason, 35 of the 100 total points in LEED v4 are distributed to reward climate change mitigation strategies.
The LEED process addresses a structure’s planning, design, construction, operations and end of life as well as considering energy, water, indoor environmental quality, materials selection and location. Green buildings reduce landfill waste, enable alternative transportation use and encourage retention and creation of vegetated land areas and roofs.
LEED rewards thoughtful decisions about building location, with credits that encourage compact development and connection with transit and amenities. When a building consumes less water, the energy otherwise required to withdraw, treat and pump that water from the source to the building are avoided. Additionally, less transport of materials to and from the building cuts associated fuel consumption.
Here are some of the ways that LEED weighs the various credits and strategies so that LEED projects can mitigate their contribution to global climate change:
- GHG Emissions Reduction from Building Operations Energy Use: To target energy use reductions directly associated with building operations. This includes all building systems and operations within the building or associated grounds that rely on electricity or other fuel sources for energy consumption.
- GHG Emissions Reduction from Transportation Energy Use: To target energy use reductions associated with the transportation of building occupants, employees, customers, visitors, business travel, etc.
- GHG Emissions Reduction from the Embodied Energy of Materials and Water Use: To target GHG-emissions reductions associated with the energy use and processes required in the extraction, production, transportation, conveyance, manufacturing, assembly, distribution, use, posttreatment, and disposal of materials, products and processed water. Any measures that directly reduce the use of potable water, non-potable water, or raw materials (e.g. reduced packaging, building reuse) will indirectly reduce energy as well because of the embodied energy associated with these product life cycles.
- GHG Emissions Reduction from a Cleaner Energy Supply: To target actions and measures that support a cleaner, less GHG-emissions intensive energy supply and a greater reliance on renewable sources of energy.
- Global Warming Potential Reduction from Non-Energy Related Drivers: To address the non-energy related climate change drivers (e.g. albedo, carbon sinks, non-energy related GHG emissions) and identifies actions that reduce these contributions to climate change (e.g. land use changes, heat island reduction, reforestation, refrigerant purchases).
Some of the top credits in LEED v4 BD+C, ID+C, and O+M that are associated with mitigating global climate change:
- LT Credit: Surrounding Density and Diverse Uses
- LT Credit: Access to Quality Transit / Alternative Transportation
- WE Credit: Outdoor Water Use Reduction
- WE Credit: Indoor Water Use Reduction
- EA Credit: Optimize Energy Performance
- EA Credit: Renewable Energy Production / Renewable Energy and Carbon Offsets
- EA Credit: Enhanced Refrigerant Management
- EA Credit: Green Power and Carbon Offsets
- MR Credit: Building Life-Cycle Impact Reduction / Interiors Life-Cycle Impact Reduction
To learn more about LEED and how it can help reduce the impact of global climate change, head to Greenbuild in Boston this November 8–10 (or check out our Greenbuild events in China or India). Greenbuild features LEED workshops, hundreds of green building educational sessions and inspiring speakers and events.