At 8pm local time on the 29 March millions of people in some of the world's major cities will use the simple action of turning off the lights for one hour to deliver a powerful message about the need for action on global warming. Hopefully this will lead people to do more than the equivalent of a drop in the bucket in terms of energy ...

The city of Orlando launched a new program on Monday that is intended to save taxpayers millions of dollars while also saving energy. The program will replace the ordinary bulbs in traffic lights with new LED lights. The proposal could also deliver improved safety for motorists. Imagine the savings of a nation-wide switch.