This method is safe for the surrounding environment and soil. The steps include:

This method typically takes a few months for the stump to become brittle and decompose.
Controlled burning should be done cautiously, preferably in less populated areas after confirming it’s legal with local authorities.

Note that controlled burning may be restricted in your area, and safety precautions are critical.
The fastest, yet most environmentally impactful method is the use of herbicide. Select a product formulated for woody plants, such as Triclopyr, and apply with caution to avoid affecting other vegetation.

The stump should absorb the herbicide and cease to be viable within a few days.
Remember, while herbicides offer a quick solution, they also carry the risk of environmental harm and should be used responsibly. Always follow local regulations regarding stump removal and consider the environmental impact of your chosen method.