There is no time to waste in tackling climate change but the world needs to be more ambitious in its targets, write Hilda Heine and Kevin Rudd.

A battle for many of the issues like justice, minority peoples, and compensation was being waged in Paris overnight as more than 100 countries joined together to demand a more ambitious global agreement on climate change.

The tiny Pacific nation of the Marshall Islands is taking on the United States and the world’s eight other nuclear-armed nations with an unprecedented lawsuit demanding that they meet their obligations toward disarmament and accusing them of “flagrant violations” of international law.