Greenpeace activists have delivered about 100 bags of coal to the entrance of the Commonwealth Bank's headquarters in Sydney in protest against its refusal to rule out future investment in new coal projects.

Protesters wearing hazmat suits pushed trolleys bearing the slogan "#Coalbank" to the bank's doorstep.

Greenpeace activists deliver a load of coal to the front of the Commonwealth Bank's Harbour Street office in Sydney on Monday to highlight the consequences of its fossil fuel lending policies. Credit:Greenpeace/James Alcock

Greenpeace spokesman Jonathan Moylan said the bank promised to support a transition to net zero emissions by 2050 but its actions made a mockery of that promise.

"By failing to exclude highly polluting fossil fuel projects like coal mines, CommBank are funding projects that destroy our environment, take a catastrophic toll on the health of communities, and accelerate climate change," he said.