Before revision: However, mustard gas stored during World War II has contaminated some sites for up to 50 years – Six Mustard gas sites uncovered – The Independent and the testing of Anthrax as a potential biological weapon contaminated the whole island of Gruinard.
After revision: However, mustard gas stored during World War II has contaminated some sites for up to 50 years and the testing of Anthrax as a potential biological weapon contaminated the whole island of Gruinard.