Commonwealth Bank is one of Australia's biggest funders of global warming. They pour billions of dollars into dirty coal and gas companies and they refuse to declare the risks they know climate change presents.

So two of CommBank's own shareholders are taking them to court.

In a world-first, Mum-and-dad shareholders Kim and Guy will challenge CommBank to disclose the material risks climate change presents to their investments. It could be a game changer.

As CommBank prepare to face court, let's make sure they know their customers - and the broader Australian community - is watching them too.

Can you sign the petition asking CommBank to ditch fossil fuels?