Toxic waste elements of computers slowly being reduced by companiesLenovo's ThinkCentre "A" series line of desktops includes models that are Energy Star-compliant, meaning the computers consume less power, emit less heat and make less noise.By Scott TavesMSNBC contributorTake one look at the Web site of any major computer company and you will see details of “green” initiatives about environmentally friendly measures dealing with the toxic materials in PCs and the excessive energy use they require.PC...