Are we, as a people, prepared to make the necessary sacrifices to achieve a world authority?

He is considered a world authority on trauma and disaster medicine.

Maybe; the world authority on thinking about how to get CO2 out of the atmosphere is here.

He's a world authority on psychology and knows what he's talking about.

Choose an obscure subject/hobby and become a world authority on it.

He is a world authority on the identification and biology of lichens.

The other was a call for some new kind of world authority adequately empowered to address what he called the "universal common good."

"I'm a world authority on a certain family of mites, but these things just don't fit into our concepts."

You're just about the world authority on this stuff.

His work, going back 40 years, made him a world authority on the greenhouse effect.