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In the 1960s, many people in North America turned their attention to environmental problems, and new steel-and-glass skyscrapers were widely criticized. Ecologists{{U}} (47) {{/U}}out that a cluster of tail buildings in a city often{{U}} (48) {{/U}}public transportation and parking lot capacities.
Skyscrapers are also{{U}} (49) {{/U}}consumers, and wasters, of electric power. In one recent year, the addition of 17 million square feet of skyscraper office space in New York City{{U}} (50) {{/U}}the peak dally demand for electricity by 120,000 kilowatts—enough to supply the entire city of Albany, New York, for a day.
Glass-walled skyscrapers can be{{U}} (51) {{/U}}wasteful. The heat loss (or gain) through a wall{{U}} (52) {{/U}}half-inch plate glass is more than ten times that through a typical masonry wall{{U}} (53) {{/U}}with insulation board. To{{U}} (54) {{/U}}the strain on heating and air-conditioning equipment, buil

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