Do you have a link to that Pew poll? I'd like to read it.

Hurricanes are strengthened by warmer waters, but it isn't correct to say that there has been no evidence of the latter due to increased CO2 emissions. As with the warming of the troposphere (the lower layer of our atmosphere, the one we live in), ocean temperatures have been rising as well. When you seen global temperature mentioned it includes the oceans.

There are a series of graphs on this page that document the warming of the oceans in recent decades:

https://www.nodc.noaa.gov/OC5/3M_HEAT_CONTENT/

The strengths of two massive hurricanes we've just witnessed were affected by warmer surface temperatures. Those temperatures were the result of weather, currents, winds, and other factors, including the effect of gradual warming of the oceans as a result of increasing CO2 emissions.