A few years ago, one of his rigs hit sour gas... and the well blew out.

It's some kind of low-level sour gas that's seeping up out of the ground.

A few years ago, one of his rigs hit sour gas... ...and the well blew out.

It's some sort of low-level sour gas. It's seeping up out of the ground.

But then you are worried about a whole sour gas scenario.

The warming is melting the tundra... but then you are worried about a whole sour gas scenario.