Problem solved, rats and dry ice
As the winters become milder each year and construction continues to boom in Delta, there has been a vast increase in the rat population, some Delta residents say epic proportions and Delta’s dirty little secret. There is now a new(ish) method for getting rid of man’s oldest pest – rats; Dry ice is an apparent safer and more effective way to kill of rats than poison. Dry ice, which is frozen carbon dioxide, is put into rat tunnels and then the holes are sealed with dirt and newspaper. As the dry ice begins to warm, it turns into carbon dioxide gas which suffocates the trapped rats. The dead rats then decompose in the tunnels. Dry ice will never replace poison, but it is effective for killing rats in tightly sealed areas and might reduce the necessity to use poison in the long term. Killing rodents with carbon dioxide gas is a very humane method that is not drawn out like poisons. Dry ice also costs about 5% of the price of conventional poisons.
https://www.linkedin.com/pulse/problem-solved-rats-ice-randy-bilesky?published=t
http://www.delta-optimist.com/opinion/blogs/blog-problem-solved-rats-and-ice-1.2347215
