I think it's important to remember that an absolute fortune was spent on ensuring that the Y2K bug did not become a massive issue.
Worldwide, $308 billion ($448 billion as of January 2018, once inflation is taken into account) was estimated to have been spent on Y2K remediation.
In Sheffield, United Kingdom, incorrect risk assessments for Down syndrome were sent to 154 pregnant women and two abortions were carried out as a direct result of a Y2K bug (miscalculation of the mother's age). Four babies with Down syndrome were also born to mothers who had been told they were in the low-risk group.
The Y2K bug was actually a massive issue - it's just that a lot of people and businesses spent a load of time and money on trying to avoid a disaster.
Normal people who did not work with it would probably not notice the significance of this because it went on behind the scenes.
The ozone layer issue is a similar thing.
When I was a kid, we were told that the hole in the ozone layer was getting bigger and it was going to get really bad.
A lot of changes were made (but they did not impact people directly - people did not have to do anything or change their lifestyle) and despite the issue not being completely resolved, it is far less bad than it was back then.
But it would be completely incorrect to say that it wasn't a problem and that it would have been fine if we just ignored it.
The same with lead in fuel. Changes were made, but with no requirement for people to change anything significant in their daily lives.
Saying that Brexit is a big load of nothing is absolutely untrue - Ford have said that they've lost $600million due to the drop in value of the pound after the Brexit referendum.
Assets worth around £800bn are leaving the UK ($1trillion) - which is a significant percentage of Britain’s £8 trillion banking sector.
Loads of jobs have already gone.
Companies have already gone bankrupt because of this.
The value of the pound has dropped by around 20%.
If Rees-Mogg really knows what he is talking about, then we should trust his statement that it could take 50 years before we see benefits of Brexit.
I've yet to see any tangible benefits of Brexit, but none of what we are seeing now is great, and there surely is nothing positive about having to live with this for another 50 years before things may improve.