If you’re buying someone a computer for Christmas — or expecting one yourself — consider a laptop. Compared to desktop PCs, laptops consume far less power. There’s also less material to recycle at the end of its service life. Look for a model featuring low-PVC, lead, and cadmium content, free from brominated flame retardants. Both Apple and Dell have made big improvements in these areas. And only do business with companies which offer recycling take-back programs.