Earth Hour challenge: can Hongkongers reduce their energy usage by just 1 per cent for the coming year?

As some Hongkongers on Saturday observed Earth Hour 2018, a challenge was sounded for the city to reduce its reliance on energy by 1 per cent till next year’s instalment of the global climate change awareness campaign. The first-ever citywide energy reduction challenge was unveiled by local organisers of the lights-out event – part of a worldwide movement where buildings go dark to promote sustainable consumption. Electricity usage across the city jumped to an all-time high last...