What king of expo would have a "Photo catalystic steel plate roof", where water [that] pours over sheet-iron coated with oxidized titanium, an optical catalyst, forms a thin film because of its diminished surface tension?The resulting accelerated evaporation by sunlight consumes more ambient latent heat, thus more quickly lowering the temperature beneath the roof.
And has a 90-meter long bamboo dome, being constructed because there is too much of it growing in the area?
With construction techniques like the one shown above?
And a biodegradable plastic exterior building wall like the one shown below?
And a press wood chip composite walkway system like this one shown below?
And water fountains made with recycled ceramics like these?
Well...that would have to be the same exhibition that has a Siberian Mammoth visitors will watch as it thaws.
And its called the EXPO 2005 in Aichi Japan