IT hardware firm Logitech has an iPad keyboard that is powered solely using solar cells and the day when other gadgets such as mobile phones and iPods can be powered using solar energy moves closer every day. The photoelectric cells integrated onto the portable keyboard generate energ

One of the simplest, yet most effective, ways of engineering the urban environment to cope with global warming is to increase the reflectivity of the cityscape so that more of the incoming sunlight is directed back into space. Painting roofs white and using light-coloured materials to