Derryck,
This is a profound question you ask: What responsibilities do we landscape photographers have to the well being of the natural world? Are we celebrating the beauty of the world while simultaneously degrading it with an extravagant carbon footprint ?
And this is also a timely question as you're at the beginning of a long and hopefully full life of taking good fotos. I'd like to see you have as fine and vital a world to observe in your camera as I have.
It's not necessary, not necessary at all, to travel long distances to find compelling subjects. No more so then it's necessary to eat foods imported from half way around the world to enjoy a good meal. I live in the midst of an estuary, where the light is often soft and the reflections are full of mystery. And I can get there in less then an hours drive, using no more then 3 gallons of gas in my compact car. I've learned to portray it by witnessing it often.
Taking fotos of your own place, your own landscape, can make for highly original work. If you look at many of the fotos on this website you'll notice a propensity for taking the same subject, be it The Grand Canyon or the craggy islands of Scotland- shutter bugs traveling thousands of miles to duplicate a scene we've already seen over and over again. I for one can hardly tell any significant difference between them. It's a paucity of originality.
I urge you to take your camera and go for a walk to a place that intrigues you. Do it many times. The light will never be quite the same, your mood will never be quite the same, but you'll return with fotos that will reveal a depth of understanding and a degree of proficiency that no long distance junket can ever match.
I wish you well.
Richard