{"id":6206,"date":"2010-03-17T11:08:07","date_gmt":"2010-03-17T17:08:07","guid":{"rendered":"http:\/\/blog.sustainablog.org\/?p=6206"},"modified":"2010-03-17T11:08:07","modified_gmt":"2010-03-17T17:08:07","slug":"green-building-design-zero-carbon","status":"publish","type":"post","link":"https:\/\/sustainablog.org\/articles\/green-building-design-zero-carbon\/","title":{"rendered":"Moving Towards Zero-Carbon Buildings"},"content":{"rendered":"
\"The
The Empire State Building is one of many scheduled for green renovations<\/figcaption><\/figure>\n

The building sector is responsible for a large share of world electricity consumption and raw materials use. In the United States, buildings\u2014commercial and residential\u2014account for 72 percent of electricity use and 38 percent of CO2<\/sub> emissions. Worldwide, building construction accounts for 40 percent of materials use.<\/p>\n

Because buildings last for 50\u2013100 years or longer, it is often assumed that cutting carbon emissions in the building sector is a long-term process. But that is not the case. An energy retrofit of an older inefficient building can cut energy use and energy bills by 20\u201350 percent. The next step, shifting entirely to carbon-free electricity, either generated onsite or purchased, to heat, cool, and light the building completes the job. Presto! A zero-carbon operating building.<\/p>\n

Zero Carbon Building Development: The Global Picture<\/h2>\n

Some countries are taking bold steps. Notable among them is Germany, which as of January 2009 requires that all new buildings either get at least 15 percent of space and water heating from renewable energy or dramatically improve energy efficiency. Government financial support is available for owners of both new and existing buildings. In reality, once builders or home owners start to plan these installations, they will quickly see that in most cases it makes economic sense to go far beyond the minimal requirements.<\/p>\n

There are already signs of progress in the United States, including provisions within the 2009 American Recovery and Reinvestment Act designed to stimulate the economy. Among other items, it provides for the weatherization of more than a million homes, beginning with an energy audit. A second part calls for the weatherization and retrofitting of a large share of the nation\u2019s stock of public housing. A third component is the greening of government buildings by making them more energy-efficient and, wherever possible, installing devices such as rooftop solar water and space heaters and rooftop solar electric arrays.<\/p>\n

LEED, Green Building Design, and Zero Carbon<\/h2>\n

In the private sector, the U.S. Green Building Council (USGBC)\u2014well known for its Leadership in Energy and Environmental Design (LEED) certification and rating program\u2014heads the field. This voluntary program has four certification levels\u2014certified, silver, gold, and platinum. A LEED-certified building must meet minimal standards in environmental quality, materials use, energy efficiency, and water efficiency. LEED-certified buildings are attractive to buyers because they have lower operating costs, higher lease rates, and typically happier, healthier occupants than traditional buildings do.<\/p>\n

The LEED certification standards for construction of new buildings were issued in 2000. In 2004 the USGBC also began certifying the interiors of commercial buildings and tenant improvements of existing buildings. And in 2007 it began issuing certification standards for home builders.<\/p>\n

Looking at the LEED criteria provides insight into the many ways buildings can become more energy-efficient. The certification process for new buildings begins with site selection, and then moves on to energy efficiency, water efficiency, materials use, and indoor environmental quality. In site selection, points are awarded for proximity to public transport, such as subway, light rail, or bus lines. Beyond this, a higher rating depends on provision of bicycle racks and shower facilities for employees. New buildings must also maximize the exposure to daylight, with minimum daylight illumination for 75 percent of the occupied space. The use of renewable energy adds still more points.<\/p>\n

Thus far LEED has certified 1,600 new buildings in the United States, with some 11,600 planned or under construction that have applied for certification. The commercial building space that has been certified or registered for certification approval totals 5 billion square feet of floor space, or some 115,000 acres (the equivalent of 115,000 football fields).<\/p>\n

The Chesapeake Bay Foundation\u2019s office building for its 100 staff members near Annapolis, Maryland, was the first to earn a LEED platinum rating. Among its features are a ground-source heat pump for heating and cooling, a rooftop solar water heater, and sleekly designed composting toilets that produce a rich humus used to fertilize the landscape surrounding the building.<\/p>\n

Toyota\u2019s North American headquarters in California, which houses 2,000 employees, has a LEED gold rating and is distinguished by a large solar facility that provides much of its electricity. Waterless urinals and rainwater recycling enable it to operate with 94 percent less water than a conventionally designed building of the same size. Less water use also means less energy use.<\/p>\n

A 60-story office building with a gold rating being built in Chicago will use river water to cool the building in summer, and the rooftop will be covered with plants to reduce runoff and heat loss. Energy-conserving measures will save the owner $800,000 a year in energy bills. The principal tenant, Kirkland and Ellis LLP, a Chicago-based law firm, insisted that the building be gold-certified.<\/p>\n

The state of California commissioned Capital E, a green building consulting firm, to analyze the economics of 33 LEED-certified buildings in the state. The study concluded that certification raised construction costs by $4 per square foot but that because operating costs as well as employee absenteeism and turnover were lower and productivity was higher than in other buildings, the standard- and silver-certified buildings earned a profit over the first 20 years of $49 per square foot, and the gold- and platinum-certified buildings earned $67 per square foot.<\/p>\n

In 2002 a global version of the USGBC, the World Green Building Council, was formed. As of spring 2009 it included Green Building Councils in 14 countries, including Brazil, India, and the United Arab Emirates. Eight other countries\u2014ranging from Spain to Viet Nam\u2014are working to meet the prerequisites for membership. Among the current members, India ranks second in certification after the United States, with 292 million square feet of LEED-certified floor space, followed by China (287 million) and Canada (257 million).<\/p>\n

Renovating for Zero Carbon Emissions<\/h2>\n

Beyond greening new buildings, there are numerous efforts to make older structures more efficient. In 2007, the Clinton Foundation announced an Energy Efficiency Building Retrofit Program, a project of the Clinton Climate Initiative (CCI). In cooperation with C40, a large-cities climate leadership group, this program brings together financial institutions and some of the world\u2019s largest energy service and technology companies to work with cities to retrofit buildings, reducing their energy use by up to 50 percent.\u00a0 The energy service companies\u2014including Johnson Controls and Honeywell\u2014committed to provide building owners with contractual \u201cperformance guarantees\u201d assuring the energy savings and maximum costs of the retrofit project. At the launch of this program, former President Bill Clinton pointed out that banks and energy service companies would make money, building owners would save money, and carbon emissions would fall.<\/p>\n

In April 2009, the owners of New York\u2019s Empire State Building announced plans to retrofit the 2.6 million square feet of office space in the nearly 80-year-old 102-story building, thereby reducing its energy use by nearly 40 percent. The resulting energy savings of $4.4 million a year is expected to recover the retrofitting costs in three years.<\/p>\n

Beyond these voluntary measures, government-designed building codes that set minimal standards for building energy efficiency are highly effective. In the United States this has been dramatically demonstrated in differences between California and the country as a whole in housing energy efficiency. Between 1975 and 2002, residential energy use per person dropped 16 percent in the country as a whole. But in California, which has stringent building codes, it dropped by 40 percent. The bottom line is that there is an enormous potential for reducing energy use in buildings in the United States and, indeed, the world.<\/p>\n


\nAdapted from Chapter 4, \u201cStabilizing Climate: An Energy Efficiency Revolution,\u201d in Lester R. Brown, Plan B 4.0: Mobilizing to Save Civilization<\/strong> (New York: W.W. Norton & Company, 2009), available on-line at www.earthpolicy.org\/index.php?\/books\/pb4<\/a><\/em><\/p>\n

Want to green your own building? Take the first steps with energy efficient lighting<\/a>.<\/em><\/p>\n

Image credit:<\/strong> http:\/\/www.flickr.com\/photos\/89241789@N00\/<\/a> \/ CC BY 2.0<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

The building sector is responsible for a large share of world electricity consumption and raw materials use. 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