Based on the following, what is the best description of the relationship between lean manufacturing and sustainable manufacturing? Fairfax Assembly Paint Booth Cleaning

At GM's Fairfax Assembly Plant, paint booths were originally cleaned every other day (after production) to prevent stray drops or chips of old paint from attaching to subsequent paint jobs. It was discovered, however, that the automated section of the painting operations really only needed to be cleaned once a week, as long as the cleaning was thorough, and larger holes were cut in the floor grating to allow for thicker paint accumulations. The reduction in cleaning frequency facilitates improvements in the process "up-time" and flow. As an additional benefit, through this and other more efficient cleaning techniques, use of purge solvent decreased by 3/8 of a gallon per vehicle. When combined with reductions achieved by solvent recycling, VOC emissions from purge solvent reduced by 369 tons in the first year following these adjustments.
The primary goal of lean manufacturing is to reduce pollution.
Environmental concerns typically increase the costs of sustainable manufacturing.
Environmentally friendly solvents are the only way to reduce emissions.
Using fewer chemicals reduces pollution as well as improves efficiencies in manufacturing.