You probably don't buy a lot of oil directly from the people who extract it from the ground, and nor do most people. The oil industry is at threat from the young though - and that's because nobody wants to work in it. For decades, people who work in the oil industry have been painted as greedy and corrupt. Oil has also been seen as the cause - or at least a factor - in many armed conflicts all over the world. Factor in the fact that millennials are also more interested in renewable energy that fossil fuels, and you have a ticking timebomb for the oil industry.
We suspect that oil companies will always find people willing to work for them, but if the next generation decides to opt for renewable energy instead of oil in a big way, it won't take long for profit margins to get squeezed. A drop in the demand for oil would have an enormous impact on the global stock market, but to millennials, that's better than allowing oil companies to continue as they are.