Age: A heatwave strikes the city. Temperatures rise well over 40 degrees for several consecutive days. Train tracks buckle. Trees wilt. Lives are at risk. Sure, summers in the city are typically hot. But this seems a little more intense than most, and something similar happened just last year. Is this climate change? That's the question increasingly being asked by communities around the world as droughts, heatwaves and floods bring devastation to their door. For a long time, climate scientists had...