Greenhouse gas levels have never been higher. If we're to limit global warming, businesses have a crucial role to play because they operate in sectors that need to radically change, like energy, transport and finance.

Thousands of company bosses are touching down in Dubai for this year's COP28 climate change talks. But environmentalists claim many businesses are not acting fast enough.

They're increasingly concerned about the growing number of fossil fuel companies attending these summits. Are they right to be worried?

(Picture: COP28 venue ahead of the 28th Conference of the Parties to the United Nations Framework Convention on Climate Change, in Expo City Dubai. Credit: Getty Images)

Presenter: Sam Fenwick Producer: Lexy O'Connor