Releasing GE (genetically engineered, also called GM, genetically modified) organisms into the environment poses special threats to the environment and the food chain. GE crops are living and have the ability to reproduce and multiply. Through cross-pollination, the foreign genes they contain can be transferred to other crops and wild species. Genetic contamination can, therefore, magnify over time. GE seeds can also be spilt, mixed with non-GE seed and grown illegally, compounding the problems.