▁platforms ▁for ▁the ▁ 2 0 0 8 ▁U . S ▁president ial ▁elections ▁is ▁an ▁example ▁of ▁political ▁green w ash ing . ▁The ▁policy ▁c ited ▁carbon ▁capture ▁as ▁a ▁means ▁of ▁reducing ▁carbon ▁em issions ▁by ▁capt uring ▁and ▁inject ing ▁carbon ▁dio x ide ▁produced ▁by ▁coal ▁power ▁plants ▁into ▁layers ▁of ▁por ous ▁rock ▁below ▁the ▁ground . ▁According ▁to ▁Fred ▁Pear ce ' s ▁Green w ash ▁column ▁in ▁The ▁Guardian , ▁" clean ▁coal " ▁is ▁the ▁" ult imate ▁climate ▁change ▁ox ym or on " — " p ure ▁and ▁utter ▁green w ash " ▁he ▁says . ▁The ▁conversion ▁of ▁the ▁term ▁" T ar ▁S ands " ▁to ▁" O il ▁S ands ," ▁( Al berta , ▁Canada ) ▁in ▁corpor ate ▁and ▁political ▁language ▁reflect s ▁an ▁on going ▁debate ▁between ▁the ▁project ' s ▁ad her ents ▁and ▁oppon ents . ▁This ▁semantic ▁shift ▁can ▁be ▁seen ▁as ▁a ▁case ▁of ▁green w ash ing ▁in ▁an ▁attempt ▁at ▁counter ing ▁growing ▁public ▁concern ▁as ▁to ▁the ▁environmental ▁and ▁health ▁impact s ▁of ▁the ▁industry . ▁While ▁advoc ates ▁claim ▁that ▁the ▁shift ▁is ▁scientific ally ▁derived ▁to ▁better ▁reflect ▁the ▁usage ▁of ▁the ▁s ands ▁as ▁a ▁prec ursor ▁to ▁oil , ▁environmental ▁groups ▁are ▁claim ing ▁that ▁this ▁is ▁simply ▁a ▁means ▁of ▁clo aking ▁the ▁issue ▁behind ▁friend lier ▁termin ology . ▁Over ▁the ▁past ▁years ▁Wal mart ▁has ▁proc laimed ▁to ▁" go ▁green "