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How exactly this would be done is fascinating – because it's about increasing the surface area of each individual plant, not growing tentacular cacti of living silver, or mirrored roses in rows unfolding across remote landscapes. Rather than metallic plantlife, that is, or cyborg-plants, we just need denser, lighter colored leaves. For instance, "an extra-hairy variety of soya bean... reflects about 5% more sunlight than normal," and "growing broadleaf varieties of trees instead of conifers" could be enough to reflect several percentage points more. And there is an architectural side to all this: "Other scientists have suggested different ways to cool the planet [such as] painting roads, roofs and car parks white."

http://bldgblog.blogspot.com/2008/01/mirrored-crops-and-white-gardens-or.html

http://www.bdonline.co.uk/feature.asp?featurecode=12025 The joy of parkimng