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ACQ Preserve, a new type of pressure-treated wood, will now carry a "Green Cross and Globe" label. The label was awarded by Scientific Certification Systems (SCS), an independent group that rates the environmental impact of manufactured products. ACQ Preserve is currently the only pressuretreated wood to carry the group's "green" label. The SCS stamp of approval bears out the manufacturer's claim that its new patented formulation creates far less toxic waste than the widely used chromated copper arsenate (CCA). Chemical Specialties Inc. (CSI), one of the country's three major wood treaters, introduced ACQ Preserve early this year. CSI will continue to produce CCA-treated lumber, which costs less than ACQ Preserve, but the company is offering its new product as an "environmentally advanced" alternative. Because ACQ Preserve contains no chromium or arsenic, CSI says