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This is a question that many Departments of Transportation have struggled with as well! There are other chemicals that you can use, but all of them will have at least some impact on the environment. Even sand can cause problems in our stormwater systems. Other chlorides (magnesium chloride and calcium chloride) are popular as alternatives, but still have ...
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I think it would be milk paint.
http://www.milkpaint.com/
Milk Paint receives USDA Biobased Certification
Safe for MCS, Hospitals, Children's things and the Environment
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Sticky Fly Traps are great in greenhouses, but rapidly overwhelmed outdoor. And ladybirds are inefficient in face of an herd of green flies protected by ant shepherds (the ants protect the greenflies from which they eat some secretion). Having tried several solutions, the best thing for me is to spray a mix of black soap and water.
The basic recipe is to ...
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Ducks will eat slugs and produce duck eggs (hens), duck meat (hens and drakes), and high-nitrogen contributions (poop) to your compost pile or directly in your garden area.
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If you want commercial products check out Good Guide, they rank products based on ingredient hazards and larger environmental impact. They have an extremely large database and rank things from cleaners to food to makeup.
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