I'd prefer not to have them, really, but a lot of the herbicides that target them .... well, they have "icide" in the name for a reason.
Those poisons don't go away. They stop being on your lawn because rain washes them into the ground and into the storm sewers.
And they're still not gone. People think, "Oh, the water treatment plant will get rid of them." They don't. They don't get a chance.
When the poison eventually gets to a storm sewer, it follows our nations rivers and streams. Around here we're ultimately sending our poisons, fertilizers and chemicals down the Mississippi.
Now, there's a massive dead zone the size of New Jersey near New Orleans in the Gulf of Mexico.
Fish and plants can't live there. There's not enough oxygen. And it's because of what we, the residents of the U.S., are putting on our fields and lawns and into our storm sewers.
It never goes away. It just goes somewhere else. Your lawn may be weed free, but the price was part of our planets water and sealife.