(CNN) -- Even the most cheerless environmental activist would find it hard not to register the faintest trace of a smile seeing Christmas lights shimmering in the murk of a December evening. Any lingering sense of 'green guilt' over the environmental cost of a billion festive bulbs being switched on should quickly dissipate in the bursts of electric color festooning our streets and houses. But if that isn't enough to placate an ardent activist there is, thankfully, environmentally-friendly light at the end of the tunnel.
There's an awful lot of information on what is wrong with our energy use and policies, but little information on how to bring change at home today. The answer could be as easy as changing a light bulb. Asad Jafari. Lucknow, India.
It will take the environmentalist in each one of us to do that! Anup Nambiar, Kochi, Kerala, India.
One. Too many hands from multiple environmentalists reaching for the bulb only promotes a physical competition. Paul Davey, West Australia. E-mail to a friend