Ottawa Citizen: Sea Sick: The Global Ocean in Crisis By Alanna Mitchell McClelland & Stewart, $32.99 Even if you think you understand what humanity faces in the enormous challenge that is climate change, reading Alanna Mitchell’s new book Sea Sick: The Global Ocean in Crisis will make you realize how little humans understand about our impact on the planet. Large swaths of the planet’s population now accept — after years of warning by scientists — that the burning of fossil fuels …