If Dubai's Burj Al-Arab hotel with its billowing sail is changing world architecture, wait till the India Tower, currently under construction on Mumbai's marine row Queen's Necklace, gets into business in 2010. At 300 m, it may not match Burj in height (321 metres) but it will stand tall for doing it the right way. It will be powered by a solar chimney, use recycled raw materials such as aluminum, steel, tiles (made of recycled glass and minerals), bamboo products, non-toxic paints, fly ash - cement (a byproduct of heating coal) and have a green roof.