Finland lacks domestic sources of fossil energy and must import substantial amounts of petroleum, natural gas, and other energy resources, including uranium for nuclear power.

Energy consumption in Finland per capita is the highest in European Union. Reasons for this include industries with high energy consumption (half of energy is consumed by industry), high standards of living, cold climate (25% of consumption is used in heating) and long distances (16% of consumption is used in transport).

https://en.wikipedia.org/wiki/Energy_in_Finland

I think you guys have a lot more to worry about than RC Jets?

Most countries have serious issues in regards to EPA type regulations for repurposing airports. The various toxins ( fuels, oils and fire fighting foams ) that leach into the soils over the 30~50 years of life makes a very expensive cleanup that simply makes the land too expensive. Those airports that are redeveloped normally turn in to wasteland years later as developers have cut corners or were unaware of the issues, then the lawyers come in.

As previously outlined large models fly less, and smaller models fly more. So maybe 6 times for a XXXL model and 50~100 times for a smaller model per yr? I would say your smaller model is going to have a much larger environmental impact? Lets face it when the environmental impact of model aircraft a become an issue I am sure there will be far bigger issues centre stage.

Aust has unused airports everywhere, and with the coming VTOL airframes there will be even more.

Regards,