Essay The talk explains how the environmental concerns have changed over the history. At the turn of the 20th century, the horse dump was considered the main environmental problem that cities all around the world were facing. In the 21st century, on the other hand, finding low carbon sources of power seems a much bigger concern. Oil has made possible many discoveries that changed the world: the ICE, lipstick, CD, motorcycle and the aspirin are just few example. In the 21st century, its dominance remains, but oil is clearly causing many environmental problems. For this reason, investments are now directed toward new power alternatives and most countries such as EU, China and India are committed to solve global warming. Overall, as the cost of renewable energy and batteries fall, the transition towards low carbon fuels seems inevitable. In conclusion, changing the fuel mix will be a slow process and the shift is without any doubt on that direction.