The focus on the future climate illustrates how sustainability will become an increasing force in people's everyday lives in the future.

    In the week before the first delegates started to arrive, IMF head Christine Lagarde warned that the outlook for the worldwide economy was not as positive as had been predicted last year.

    This predication was cut to 3.7% in the latest world economic outlook from the IMF, released on Tuesday morning. At the heart of the problem is the increasing aggression in trade wars initiated by the United States, most notably against China, as president Donald Trump pursues his policy of "America First".

    The two issues of climate change and trade are inextricably linked so commentators will be watching closely what comes of the conference this week.