One in two Australians believe climate change is already damaging the Great Barrier Reef and causing more extreme storms, floods and droughts.

But only 18 per cent think the Turnbull government is doing a good job tackling global warming, a new poll has found.

An annual survey by Ipsos, which has probed public opinion on climate change for the past 12 years, shows eight in 10 agree human activity is contributing to climate change – 42 per cent say humans are mainly or entirely responsible while 38 per cent believe climate change is caused partly by humans and partly by natural processes.

Just 3 per cent of respondents think there is no such thing as climate change, a share that has hardly shifted during the past decade. Another 12 per cent believe climate change is caused entirely or mostly by natural processes.