Agence France-Presse: The environmental campaign group Greenpeace China called Tuesday on President Hu Jintao to push China to the forefront of the fight against global warming. It urged Hu to attend a key conference in the Danish capital Copenhagen in December at which nations are hoping to draw up a new agreement on minimising climate change to replace the Kyoto Protocol. “As the largest global greenhouse (gas) emitter, China can and must take a leadership role in tackling global warming,” the …