Even though they are complicated and have a negative impact on the environment, they are a key component of society. We use them to get around, power factories, and provide energy for many things. Without the use of heat engines, our world would be completely different that what it is now. Cars, planes, trains, basically all of our major ways of transportation use heat engines to get people where we need to go and these also have a huge role in the distribution of products that we use in our everyday lives.

With new innovations and technology being introduced, we are starting to find new ways to replace heat engines so we are having the negative affects on the environment, but still getting the good things that have come from the use of heat engines. Renewable energy sources are becoming a very common thing now and as we start making them better, soon they will be able to match heat engines and will be able to use those completely instead of relying on fossil fuels and sources like that.