Abstract: A process for the destruction of nest-building, tunnel digging, and other ground animal pests, includes the step of providing a container containing carbon dioxide, wherein the carbon dioxide is in a liquid form under high pressure. Very cold carbon dioxide gas from the container is introduced into the nest, tunnel or ground via a conduit, thereby to form carbon dioxide snow in the nest, tunnel or ground. The carbon dioxide snow is permitted to sublimate slowly over time, thereby to form carbon dioxide gas in situ and at low pressure in the nest, tunnel or ground at a depth below that of the air in the immediate vicinity of the pests so that the carbon dioxide drives such air upwardly at least partially from such depth into other areas of the nests, tunnels or the atmosphere above the ground so that substantially all of the pests rapidly suffocate.