Ultimately, Leinster gave the palace a "five to six" out of a possible 10-point rating. But with such large living quarters, will the queen ever be able to improve her score? To find the answer, you might have to ask Prince Charles.
The prince was "green" long before it became fashionable. He gave up playing polo to cut down on his helicopter use (and to give his aging bones a rest). He canceled the annual ski trip to Klosters to cut down on air miles. His Jaguars and Range Rovers run on biodiesel, and he limits himself to 100 miles a year in his beloved Aston Martin.
Prince Charles won the Global Environmental Citizen Award this year but was later slammed for flying with a 20-person entourage to New York to collect it.
Later this year, the prince will start publishing his carbon footprint. He claims his London pad -- Clarence House -- is already carbon neutral, and his mother appears to be following his lead. For an 81-year-old grandmother, she moves with the times, but she could never give up flying.
It's her job to jet to the faraway lands her ancestors once ruled, to shake hands and smile politely at foreigners.