The United Nations' top court has issued a landmark advisory opinion on climate change, saying all countries have to act against climate change and that a failure to address the problem could be a violation of international law.

The International Court of Justice's unanimous non-binding opinion, which is more than 500 pages long, was immediately hailed by Pacific nations as a turning point in international climate law.

• Guest: Ralph Regenvanu, Vanuatu's Minister for Climate Change
• Producer: Eddy Diamond