A surge in power use worldwide could make it harder for nations to slash emissions and keep global warming in check.
A boom in data centers and factories is straining electric grids and propping up fossil fuels.
As corporate average fuel economy requirements that started in 2012 continue to tighten, automakers have turned to an entire arsenal of tactics to reduce the fuel their vehicles burn. Downsized and turbocharged engines, transmissions with many more gears, lighter-weight structures, better aerodynamics and more all add incrementally to efficiency...