They searched the lab, and in a corner found a closet with the door closed, from which a thin green gas seeped.

By 9 April, the volcano emitted green gas and started to "bellow like a bull".

He was trying to reach the boards, but he must have already taken in a lungful of the green gas.

He knew now what the green gas could do to men.

Through the murky green gases of their environment they move slowly, numbly, without animation.

"I don't know," she said slowly, still staring at the puddle of green gas.

The green gas was sucked into the vaccuum of space.

Pushed by the wind and the rain, the green gas floated over them.

Then a green gas started to waft into the room.

What about the plan to turn our air into the choking green gas they breathe?