What is the fine-grained topic of the following text: These days, growing concerns throughout the UK about genetic modification, chemical pollution and contamination of food as well as the desire for the freshest possible local, seasonal food have caused a rise in the demand for allotment spaces, empty plots are filling fast and waiting lists are no longer a thing of the past. Only return the topic.
Rising demand for allotment spaces in the UK due to concerns about food quality and safety