When you click on the interactive version on the IPSOS website, you see that the bottom red line (for the US) shows 32% disagreeing with the statement that climate change is human-induced, and slightly lower percentages for Britain, Australia and so on.
But let's take a glass-half-full approach. Given everything we hear about the attitude to climate change on the US right, it is somewhat surprising to see that 54% of Americans (the bottom green line) actually agree that climate change is human induced. And take a look at the results for 'We are heading for environmental disaster unless we change our habits quickly'. Even in the US, 57% of those surveyed agree with that statement:
So for those who want political action on climate change, maybe public opinion is not the lever they should be pulling on. In fact, I would wager that in each of these 20 countries, major policy shifts have occurred with far lower levels of public approval. So why haven't these countries taken action on climate change already? Well, that's another discussion, but it seems it's not public opinion holding the world back.