Age: It’s Copenhagen or bust. Ben Cubby reports on a meeting that may be our only hope of doing the right thing for the planet. World leaders will meet in the Danish capital of Copenhagen in December to design a new global plan to combat climate change. The negotiations are the best chance to start reducing the world’s spiralling greenhouse gas emissions. The next 20 years are proving to be a crucial period, when scientists believe it is still possible to ward off the worst effects …