His dashboard fuel gauge filled with images of intertwining green foliage, a symbolic representation of the environmental benefits we were apparently dispensing from the tailpipe as we aimlessly drove around.

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In addition to their daily City Bike Tour, this environmentally-friendly company offers a seasonal 15-mile autumn foliage tour along the Emerald Necklace, a network of parks and green spaces southwest of the city centre.

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There were green picnic tables set out beneath the shade trees full with foliage, and on this sunny weekend afternoon there were waiters in braided white coats moving swiftly about, balancing trays laden with bottles and pitchers and plates, and men of every age gathered at each of the tables, smoking cigarettes and pipes and cigars and drinking deeply from tall beakers and earthenware mugs.

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Invisible and, often odorless, green leaf volatiles emitted from vegetation act as a defense mechanism, communicating to other foliage that danger is near.

ENGADGET: Chemical sensors could detect plants' cries for help, reduce need for pesticides

The balustrades of the stairs are of burnished, darker-green terra cotta with Shakespearean heads trapped in newel posts of luxuriant, sinuous art nouveau foliage.

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