Some of the world's top companies vowed Friday to step up efforts to cut greenhouse gas emissions, saying governments were failing to show sufficient leadership in the fight against global warming...A dozen corporations including Sony, Nokia, Nike and Hewlett-Packard issued an urgent call for firms around the world to reduce the damage they inflict on the planet and to promote a "low-carbon lifestyle"...The companies, which describe themselves as "Climate Savers", did not announce any new goals for reducing their carbon dioxide emissions as they have already committed to individual targets...Instead they pledged to urge their business partners and other companies to follow their lead.