Globe and Mail: By 2030, Canada's output from the oil sands will reach about five million barrels a day, more than twice today's output. Yet, by 2030, chances are also good that the world will have placed a price on carbon emissions to spur energy innovation and wean humanity off carbon-based fuels. By then, climate change's impact on global food security will have become starkly obvious. Already, heat waves and droughts in major grain-producing regions have caused food-price shocks and political unrest around the...