As the world tries to find viable alternative sources of energy which reduce harmful emissions, the amount of energy being consumed continues to rise. At present and for the foreseeable future, oil remains the most viable energy solution. As a result the future supply of energy and by extension the preservation of the environment relies on petroleum engineers.
Comma after "Result"
This makes petroleum engineering one of the most exciting fields and is a major reason behind why I have decided to supplement my bachelor's degree in xxx engineering by applying for a master's degree in petroleum engineering.
These subjects helped me realize that improving efficiency and producing oil in more environmentally friendly ways could save the environment while meeting energy demands.
These are just some minor corrections; your essay is well written, otherwise.
I do have a suggestion though. I found myself wondering, while reading about your visits to your father's company, what exactly was it that intrigued you during those visits and made you decide on petroleum engg? Anything in particular that you learned about the oil and gas industry that ignited your passion for the field? Maybe you could include that into your essay.
Good Luck!