Optimism over fresh deal that could limit effects of global warming

There are three paragraphs in the COP26 agreement all about 1.5 degrees and all the countries say we have to get there, explains Professor Mark Maslin (UCL Geography).

Listen: BBC Radio 4’s ‘News at 9’ (listen from 15 secs), More: BBC Radio 2’s ‘News at 9’ (from 13 secs)