On a global scale, shelter is associated with about 25% of the
greenhouse gas emissions embodied in household purchases and 26% of households'
land use.
Sustainable homes are built using sustainable methods, materials, and facilitate green practices, enabling a more sustainable lifestyle. Their construction and maintenance have neutral impacts on the Earth. Often, if necessary, they are close in proximity to essential services such as grocery stores, schools, daycares, work, or public transit making it possible to commit to sustainable transportation choices. Sometimes, they are
off-the-grid homes that do not require any public energy, water, or sewer service. If not off-the-grid, sustainable homes may be linked to a grid supplied by a
power plant that is using sustainable power sources, buying power as is normal convention. Additionally, sustainable homes may be connected to a grid, but generate their own electricity through renewable means and sell any excess to a utility. There are two common methods to approaching this option:
net metering and double metering. are generally sited so as to create as little of a negative impact on the surrounding
ecosystem as possible, oriented to the sun so that it creates the best possible
microclimate (typically, the long axis of the house or building should be oriented east–west), and provide natural shading or wind barriers where and when needed, among many other considerations. The design of a sustainable shelter affords the options it has later (i.e.: using
passive solar lighting and heating, creating temperature buffer zones by adding porches, deep overhangs to help create favorable microclimates, etc.) Sustainably constructed houses involve environmentally friendly management of waste building materials such as recycling and composting, use non-toxic and renewable, recycled, reclaimed, or low-impact production materials that have been created and treated in a sustainable fashion (such as using organic or water-based finishes), use as much locally available materials and tools as possible so as to reduce the need for transportation, and use low-impact production methods (methods that minimize effects on the environment). In April 2019, New York City passed a bill to cut
greenhouse gas emissions. The bill's goal was to minimize the
climate pollution stemming from the hub that is New York City. It was approved in a 42 to 5 vote, showing a strong favor of the bill. The bill will restrict energy use in larger buildings. The bill imposes greenhouse gas caps on buildings that are over 25,000 square feet. The calculation of the exact cap is done by square feet per building. A similar emission cap had existed already for buildings of 50,000 square feet or more. This bill expands the legislation to cover more large buildings. The bill protects
rent-regulated buildings of which there are around 990,000. Due to the implementation of the bill, around 23,000 new
green jobs will be created.
Sustainable building materials Some building materials might be considered "sustainable" by some definitions and under certain conditions. For example, wood might be thought of as sustainable if it is grown using
sustainable forest management, processed using
sustainable energy, delivered by
sustainable transport, etc. Under different conditions, however, it might not be considered as sustainable. The following materials might be considered as sustainable under certain conditions, based on a
Life-cycle assessment: •
Adobe •
Bamboo •
Cellulose insulation •
Clay •
Cob • Composite wood (when made from reclaimed hardwood sawdust and reclaimed or recycled plastic) •
Compressed earth block •
Cordwood •
Cork •
Hemp •
Insulating concrete forms •
Lime render •
Linoleum • Lumber from
Forest Stewardship Council approved sources •
Natural rubber •
Natural fiber (
coir,
wool,
jute, etc.) • Organic cotton insulation •
Papercrete •
Rammed earth • Reclaimed stone • Reclaimed brick • Recycled metal • Recycled concrete • Recycled paper • Soy-based adhesive • Soy insulation •
Straw bale •
Structural insulated panel •
Wood Insulation of a sustainable home is important because of the energy it conserves throughout the life of the home. Well insulated walls and lofts using green materials are a must as it reduces or, in combination with a house that is well designed, eliminates the need for heating and cooling altogether. Installation of insulation varies according to the type of insulation being used. Typically, lofts are insulated by strips of insulating material laid between rafters. Walls with cavities are done in much the same manner. For walls that do not have cavities behind them, solid-wall insulation may be necessary which can decrease internal space and can be expensive to install. Equipping roofs with highly reflective material (such as aluminum) increases a roof's
albedo and will help reduce the amount of heat it absorbs, hence, the amount of energy needed to cool the building it is on.
Green roofs or "living roofs" are a popular choice for thermally insulating a building. They are also popular for their ability to catch storm-water runoff and, when in the broader picture of a community, reduce the heat island effect (see
urban heat island) thereby reducing energy costs of the entire area. It is arguable that they are able to replace the physical "footprint" that the building creates, helping reduce the adverse environmental impacts of the building's presence.
Energy efficiency and water conservation are also major considerations in sustainable housing. If using appliances, computers,
HVAC systems, electronics, or lighting the sustainable-minded often look for an
Energy Star label, which is government-backed and holds stricter regulations in energy and water efficiency than is required by law. Ideally, a sustainable shelter should be able to completely run the appliances it uses using renewable energy and should strive to have a neutral impact on the Earth's water sources
Greywater, including water from washing machines, sinks, showers, and baths may be reused in landscape
irrigation and toilets as a method of water conservation. Likewise,
rainwater harvesting from storm-water runoff is also a sustainable method to conserve water use in a sustainable shelter.
Sustainable Urban Drainage Systems replicate the natural systems that clean water in wildlife and implement them in a city's drainage system so as to minimize contaminated water and unnatural rates of runoff into the environment. See related articles in:
LEED (Leadership in Energy and Environmental Design) and also it is one of the most important factor of sustainable lifestyle. ==Power==