What are the five ways to save taj mahal?

The five ways suggested by UNESCO and Indian experts to preserve one of world's seven wonders Taj Mahal in Agra, in the wake of its developing a ''cancer of marble' or losing its sheen, are :

1. Restrict visitors

2. Reduce vehicular emissions in area

3. Relocate coal based Mathura Oil Refinery

4. Plant shrub around the perimeter of the area with the ability to absorb pollutants

5. Use fuller's earth (multani mitti) to clean it 50-odd years later .