The West Coast wildfires have lifted climate change to the top of the campaign agenda, but will it actually shift any votes? It highlights one of sharpest policy contrasts between the two presidential candidates - with Donald Trump questioning whether global warming is even a threat, while Joe Biden has a detailed $2.5 trillion plan to decarbonise the economy.

Justin Rowlatt speaks to David Banks, a former energy advisor to both President Trump and George W Bush, as well as Cheryl LaFleur, who served as an energy regulator under Barack Obama. Plus the BBC's North America correspondent Anthony Zurcher discusses electoral calculations behind each candidate's stance.

(Picture: A firefighter watches the fire burning in Monrovia, California; Credit: Ringo Chiu/AFP via Getty Images)