Thank you very much, you two, for joining us here today, and thank you for your contributions to research in your fields, which is very impressive.
I wonder if I can start with your point number 17. I just want to clarify, and it doesn't really matter who answers.
In the sentence, “Driving this migration is an increased desire to be environmentally-friendly and questions on the future accessibility and/or depletion of petroleum”, could you just clarify what you mean by that last little bit there, the “depletion of petroleum”?