How much wood is needed to bring 1 liter of water to the boil?

To bring 1 liter of water to a boil, you would need approximately 0.24 kilograms of wood. This is based on the energy content of wood, which is around 16-20 megajoules per kilogram. The specific amount of wood required can vary depending on factors such as the type of wood, its moisture content, and the efficiency of the burning process.