spreading an energy revolution, page-23

The huge sky scraper and bridges we build today would have been unimaginable my most 100 years ago.

What a strange thing to say. Man has been building impressive structures for centuries. Th Harbour Bridge was opened 80 years ago. It could not have been "unimaginable" to it's designer a mere 20 years before. The Empire State Building is older.

You should think before saying such silly things.