Outdoorsy types tend to spend a lot of time and money on the perfect warm boots for winter weather, but there’s another key bit of kit for keeping your feet cosy in the cold – great thermal socks.

The share of thermal generation, which is mainly coal-fired, with only a tiny amount of natural gas, rose 8.9% from a year earlier to 545.1 billion kWh. The main reason for the increase in coal ...