What is the best statement of the problem of insect repellent?

The problem of insect repellent revolves around the challenge of effectively deterring insects while ensuring safety and minimal environmental impact. Many conventional repellents contain chemicals that can be harmful to human health and ecosystems, raising concerns about their widespread use. Additionally, the effectiveness of repellents can vary based on factors such as the species of insect, duration of protection, and user preferences. Finding a balance between efficacy, safety, and environmental sustainability remains a key issue in the development of insect repellents.