Extinction Rebellion activists aim to increase the size and impact of protests seen in April which shut down parts of the British capital.
But police say they will respond more robustly this time to protesters who break the law.
Stuart Hazeldene from Edinburgh University says he believes the activism is having an impact.
IN: "If you...
OUT: ...agenda."
DUR: 20 seconds
http://www.fsnradionews.com/feeds/1007climate-hazeldene1.mp3