Journalist McKenzie Funk is an adventurer, as much in his intellectual pursuits as in his taste for sport. He would rather climb a 26,000-foot mountain than hang with the press corps. So it is with his new book, “Windfall: The Booming Business of Global Warming,” which recounts myriad efforts to cash in on climate change. An absurd display of Canadian militarism first piqued Funk’s interest in the topic. In 2006, he found himself aboard the Canadian frigate HMCS Montréal as it surged toward the Northwest Passage.