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Veronica Boix Mansilla's and Anthony Jackson's book "Educating For Global Competencies: Preparing Our Youth to Engage the World" is an excellent resource for internationally-minded teachers.
The Asia Society is doing some really interesting work in education for global competencies, which they define as "the capacity and disposition to understand and act on issues of global significance."
This book articulates how teachers and schools can graduate globally competent students, as well as the skills and knowledge students need in the 21st century. From the book's introduction, "Globally competent individuals are aware, curious, and interested in learning about the world and how it works. They can use the big ideas, tools, methods, and languages that are central to any discipline (mathematics, literature, history, science, and the arts) to engage the pressing issues of our time. They deploy and develop this expertise as they investigate such issues, recognizing multiple perspectives, communicating their views effectively, and taking action to improve conditions."
The chapter on teaching for global competencies is particularly valuable. It tries to answer the questions, "What does quality teaching for global competence look like?" and "How can teachers design instruction to foster global competence among their students?"
The book can be downloaded for free via the Asia Society: http://asiasociety.org/files/book-globalcompetence.pdf