I read that some of the local flooding, with rivers bursting their banks, is because an EU directive has stopped the banks being shored up annually, with the natural excess silt, to help prevent flooding, as went on for centuries before. Instead it has been 'taken away'. The directive was to protect animal habits which, of course, is a good thing but, if the river then floods, the habitats are destroyed anyway, so it's counter productive.
A similar thing in Australia, which increased the fire risk,(although not because of the EU, obviously) was that the undergrowth in forests stopped being removed- at the behest of the conservationists. The Aborigines had been doing this previously for centuries as it created natural fire breaks, with the consequences we have seen recently. The new ways are not necessarily better than the old.
Anyway, whether EU laws were good or bad is irrelevant. They were foisted on us by unelected bureaucrats and that was the whole point of Brexit- to gain back control. Please let's not pretend that locally elected MEPs had any real say in the processes. We are free now ( or should be in a year's time) to make our own laws, even though the EU still seems to think it has the right to rule over us thereafter!