Environment

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Optional low-rolling-resistance tires developed especially for the Panamera help this hybrid performance sedan deliver its impressive NEDC fuel economy figure.

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Rescue workers search for victims buried under the rubble near the Canterbury Television building in Christchurch, New Zealand, Wednesday night, Feb. 23, 2011. Students from across Asia are feared among the dead in the CTV building that collapsed in Tuesday's earthquake, with police saying Wednesday that they were "100 percent certain" no one trapped in the rubble was alive. (AP Photo/Kyodo News, Shuzo Shikano)

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Liberty Homes is building 43 town homes at the Landing at Emerson, near commuter routes and shopping centers in Columbia. The homes have 1,782 to 1,935 finished square feet, with base prices from the $340,000s.

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The great room features three living areas: a breakfast area, a state-of-the-art kitchen and a family area with a gas fireplace.

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Ryan Homes' Victoria Falls model at Port Potomac Estates in Woodbridge features a center-island kitchen with 42-inch maple cabinets, granite counters, a pantry and recessed lighting. It is priced from $404,990.

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Ryan Homes is building single-family homes on quarter-acre sites at Port Potomac Estates in Woodbridge. The homes have 1,852 to 5,105 finished square feet, with base prices from $384,990 to $417,990.

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An emergency vehicle stands by near the runway as space shuttle Discovery lands at the Kennedy Space Center in Cape Canaveral, Fla., Wednesday, March 9, 2011. (AP Photo/John Raoux)

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A member of the Uganda Electoral Commission checks ballot boxes in Kampala. An African mission led by Zimbabwean Ambassador Simbi Veke Mubako was sent to observe the presidential election Friday. (Associated Press)

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In this photo taken Feb. 10, 2011, people collect recyclable materials from Jardim Gramacho municipal landfill where the documentary "Lixo Extraordinario," or Waste Land," was filmed in Rio de Janeiro, Brazil. After decades of anonymity, the workers have been catapulted to fame by a collaboration with Brazilian artist Vik Muniz, who used the trash they sort to create portraits of the pickers. A documentary recording that experience is now vying for an Oscar. (AP Photo/Felipe Dana)

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Rescue crews work to extinguish a fire at a collapsed building in central Christchurch, New Zealand, on Tuesday. A powerful earthquake collapsed buildings at the height of a busy workday Tuesday, killing and trapping dozens in one of the country's worst natural disasters. (Associated Press)

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An injured person is carried by rescue workers after an earthquake rocked Christchurch on Tuesday. The 6.3 magnitude quake hit Tuesday, toppling tall buildings and churches, crushing buses and killing dozens of people. (Associated Press)

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ALTERNATE CROP OF NZH802 - Rescue workers work to extinguish a fire at a collapsed building in central Christchurch, New Zealand, Tuesday, Feb. 22, 2011. A powerful earthquake collapsed buildings at the height of a busy workday Tuesday, killing and trapping dozens in one of the country's worst natural disasters. (AP Photo/New Zealand Herald, Mark Mitchell) NEW ZEALAND OUT, AUSTRALIA OUT

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Rescue workers climb onto the collapsed Pyne Gould Guinness Building in central Christchurch, New Zealand, Tuesday, Feb. 22 2011. A powerful earthquake collapsed buildings at the height of a busy workday killing at least 65 people and trapping dozens in one of the country's worst natural disasters. (AP Photo/New Zealand Herald, Mark Mitchell)

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In this image made from video run by New Zealand's TVNZ, a wounded woman is helped by others following a strong earthquake in Christchurch, New Zealand Tuesday, Feb. 22, 2011. The 6.3-magnitude earthquake rocked the southern New Zealand city of Christchurch on Tuesday, seriously injuring people and damaging buildings throughout the city. (AP Photo/TVNZ via Associated Press Television News)

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Rescue workers work to extinguish a fire at a collapsed building of King's Education in central Christchurch, New Zealand, Tuesday, Feb. 22, 2011. A powerful earthquake collapsed buildings at the height of a busy workday killing and trapping dozens of people in one of the country's worst natural disasters. In the collapsed King's Education building, several among a group of 23 Japanese exchange students and teachers were still unaccounted for. (AP Photo/New Zealand Herald, Mark Mitchell)

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Rescue workers and a helicopter work to extinguish a fire at a collapsed building of King's Education in central Christchurch, New Zealand, Tuesday, Feb. 22, 2011. A powerful earthquake collapsed buildings at the height of a busy workday killing at least 65 people and trapping dozens in one of the country's worst natural disasters. Several among a group of 23 Japanese exchange students and teachers at King's Education were still unaccounted for. (AP Photo/New Zealand Herald, Mark Mitchell)

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A collapsed building is barricaded following an earthquake in Christchurch, New Zealand, Tuesday, Feb. 22, 2011. A powerful earthquake collapsed buildings at the height of a busy workday Tuesday, killing and trapping dozens in one of the country's worst natural disasters. (AP Photo/New Zealand Herald)

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Rescue workers search for victims after an earthquake rocked Christchurch, New Zealand, Tuesday, Feb. 22, 2011. The 6.3-magnitude quake hit at the height of a busy workday, toppling tall buildings and churches, crushing buses and killing dozens of people in one of the country's worst natural disasters. (AP Photo/NZPA, David Wethey)

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An injured person is carried by rescue workers after an earthquake rocked Christchurch, New Zealand, Tuesday, Feb. 22, 2011. The 6.3-magnitude quake hit at the height of a busy workday Tuesday, toppling tall buildings and churches, crushing buses and killing dozens of people in one of the country's worst natural disasters. (AP Photo/NZPA, David Wethey)

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