 So probably the simplest thing that we wanna do is just briefly introduce each of these factors and then to have a look at them in a little bit more detail in a case study that you'll do a little bit later. So firstly, the environmental factors. So when we're considering environmental factors, we wanna look at mining. That's going to be the first factor that's actually going to have a specific effect, where and how. We're also going to be looking at things such as the use and the consequence. So if a large number of these hydrocarbons are used for things like combustion reactions, then this is going to have an impact on things like carbon dioxide levels in the atmosphere. If however they're used to produce things like polymers or plastics, this may also have an impact on the waste disposal and the fact that we have a lot of plastics now in our oceans and also on our land.