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They use herbicide to kill weeds?!
Here in Portugal there is a recent law that prohibits regular people to use "heavy" herbicides, they only can buy diluted herbicides in supermarkets. That's why in volunteer​ actions we usually don't use it.

I wished nobody could use it!! It is so bad for everything, including our health!

I understand, but I still accept its utilization, in sporadic situations, like to kill invasive plants that can't be removed/ killed by other means.