EnvironmentVertical farm cuts energy use 75 per cent by using sunlight A vertical farm built inside a greenhouse in Texas can produce hundreds of thousands of heads of lettuce with significantly less energy than usual ¿ìè¶ÌÊÓÆµ
TechnologyWindows filled with see-through wood layer help hold in heat A transparent material made from cellulose nanofibres and pockets of gas could replace air in double-glazed windows to improve thermal insulation ¿ìè¶ÌÊÓÆµ