Final answer:
The main driver of change in the fire service is the need to adapt to evolving fire regimes and manage their consequences in the context of global environmental change.
Step-by-step explanation:
The main driver of change in the fire service, according to Essentials of Fire Department 8, is the need to adapt to evolving fire regimes and manage their consequences. This is especially important in the context of increasing global environmental change, including climate change. The goal is to achieve sustainable fire management that balances the protection of life and property with the maintenance of biodiversity and ecosystem services.