Climate change is constant and natural. I live in Canada. A mere 20,000 years ago, 97 per cent of my country was covered with ice. The fact that that ice melted away on its own tells us that Mother Earth has her own rhythms. As a journalist, I have no opinion on whether human activity is having a significant (as opposed to a minor) impact on the world’s climate. What I can tell you is that there are many highly credentialed, experienced, reputable scientists who doubt this. I consider it my job to let the public know that those views exist.