fishing weights and lead.

In a growing number of areas outside Minnesota, non-lead tackle isn't just a good idea — it's the law. Restrictions and bans of lead fishing sinkers and jigs are becoming more common in the United States and other countries.

New Hampshire has banned the use and sale of lead fishing sinkers that weigh less than an ounce and lead jigs smaller than an inch.
Maine and New York (press release | law) have banned the sale of lead sinkers weighing a half-ounce or less.
In 2004, the Vermont Legislature passed a bill prohibiting the use and sale of lead sinkers weighing 1/2 ounce or less.
Great Britain restricted the use of lead fishing weights weighing less than 1 ounce.

In Canadian national parks and national wildlife areas, it is illegal to use lead fishing sinkers and jigs weighing less than 50 grams, a ban that went into effect in 1997. In 2002, the Canadian House of Commons debated proposed legislation to expand the restrictions of lead tackle use across the country. In February 2004, Environment Canada—the federal agency in Canada responsible for environmental protection issues—announced its intent to pursue actions to prohibit the import, manufacture, and sale of lead sinkers and jigs.
The U.S. Fish and Wildlife Service has already banned lead sinkers in two national wildlife refuges and Yellowstone National Park. It is currently discussing restrictions on the use of lead sinkers and jigs at other national wildlife refuges where loons and trumpeter swans breed.