Use an example to describe how the combustibility of a substance can be both useful and dangerous.

Nice question buddy.e.g. Combustion of fossil fuels ,it helps as combustion of fossil fuels used for cooking,fire lamb,etc,it harmful as combustion of fossil fuels releases Co2 and other harmful gases into atmosphere.Fossil Fuels examples petroleum,diesel,coal,etc

Combustion can be defined as the process in which the organic material is burned in presence of oxygen to produce carbon dioxide and energy.

This is useful because combustion provides it is provides enormous amount of energy which is used to run machines and provide heat.

It is harmful because it causes pollution in the environment as carbon dioxide is harmful for the animals and human beings above the permissible limit.

<>"The researchers stress that their approach does not offer a complete roadmap for sustainable development, but does provide an important element by identifying critical planetary boundaries. "Human pressure on the Earth system has reached a scale where abrupt global environmental change can no longer be excluded."<>