what is the connection between Harvey and climate change?

Zero

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The connection is that there are more storms like Harvey, and their effects are more severe, due to human caused climate change.

This doesn't mean that such storms did not happen before AGW, or that CO2 from fossil fuel use has no major effect on global climate.

Just as the existence of lightning fires does not mean that arson is a myth created by a leftwing plot to take over and rule the world using UN black helicopters and Obama's faked birth certificate.

Other than being among the many hurricanes past and present...nothing.

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None but your brain has already been washed.

larger storms are predicted to be caused by g.w.

No one knows for sure, because no one can run an experiment with an Earth with and without global warming and see what the differences would be.

There are some fairly obvious things associated with global warming that have connections to Harvey:

1. Increased temperatures lead to increased atmospheric water vapor, and water vapor is the "fuel" that drives hurricanes. The potential strength of storms is determined by the amount of water vapor in the atmosphere, usually expressed as sea surface temperature (SST). Harvey underwent rapid intensification that was probably connected to the very warm SSTs.

2. Water vapor is a factor in determining how much rain falls in a particular storm.

3. Research has suggested that global warming has an influence on the strength of ridges and troughs that determined the motion of Harvey.

You can assume that those factors acted in obvious, linear ways, but that may not be correct. Global warming almost certainly affected Harvey, but we don't know exactly how. We do know what to expect from global warming in terms of climatology.

warmer gulf waters fuelling hurricane

Both are the result of people turning away from God.