The current debate about global warming is "completely irrational," and people need to start taking a different approach, say two Ottawa scientists. Carleton University science professor Tim Patterson said global warming will not bring about the downfall of life on the planet. Patterson said much of the up-to-date research indicates that "changes in the brightness of the sun" are almost certainly the primary cause of the warming trend since the end of the "Little Ice Age" in the late 19th century. Human emissions of carbon dioxide (CO2), the gas of concern in most plans to curb climate change, appear to...