This kind of nonsense fuels all those climate denying websites, ''experts'', facebook groups etc. , because it's simply isn't true. Even not in the Netherlands which in is far below sea level as you might know.
Yes there is a predicted temperature and therefore water level increase, but it would be better if you know your facts, for half off europe to flood because of increasing water levels, we need to continue and increase to pollute much more than we do now.(the IPCC report assume and big increase of coal power to back these numbers)
However de trend even before this year climate hysteria was a decrease, the use of coal power as a energy source has been decreasing in the past 30 years or so.
Ontopic, if you use your car as a weapon, even get filmed doing it then you can get prosecuted and go to jail.. Whataboutery ''but they blocked the road'' isn't going to help.
It's the police's job to remove them from the road, what you see some builders doing(dragging them of the road) is very much on the edge.
Having said that, i don't see how causing traffic jams, is helping.(it means more pollution)