I think we all need to take a step back here and look at where Greg is coming from. It's clear to me that he has a lot of very fundamental misconceptions about how science actually works that are very, very common in YECs.
For starters, YECs view evolution and the age of the earth as being based entirely on presupposition rather than evidence. They believe it's motivated entirely by a desire to disprove God, and accordingly just throwing facts and evidence at them isn't going to get anywhere. We need to address that specific misconception first. That's why I always harp on about oil exploration -- it refutes this particular misconception because the only thing that matters about evolutionary models to a petroleum geologist is that they should be able to tell you where the oil is. They have to be right, not ideologically convenient.
Their exposure to science also tends to be limited to what they read in the newspapers and the popular press -- in other words, science journalism. This, as, we all know (and as they know as well), can be unreliable at best and flat-out lies at worst. As such, they very often view science itself -- or at least, "historical science" -- as a sub-discipline of journalism. As one of my YEC friends put it to me recently, "They science it all up a bit to make it sound convincing." As such, they need to have it explained to them that science is based on strict rules and protocols to ensure stringent standards of quality control, and to be given an understanding of the role of such things as measurement, calculation of errors and confidence levels, and the necessity and role of peer review and replication of results. Unfortunately, unless they've worked in an environment that has stringent quality control requirements of its own, they may have a hard time appreciating this.
Finally, they're almost certainly put off by the concept of "scientific scepticism." This is a rather unfortunate term because to most Christians (myself included, admittedly) it sounds at first glance like "unbelief." It needs to be explained to them that it isn't about unbelief at all, but about quality control, and that in fact it is actually a Biblical principle. 1 John 4:1 -- "Dear friends, do not believe every spirit, but test the spirits to see whether they are from God, because many false prophets have gone out into the world."