People who oppose a form of oil and gas drilling known as "fracking" are officially launching a petition drive to ban the practice in Michigan.
"Horizontal hydraulic fracturing" uses slant drilling to inject chemicals or water into rocks to fracture them, in order to extract oil or natural gas.
LuAnne Kozma is the campaign's director.
She says fracking uses toxic chemicals that can contaminate the water.
"Another huge concern is this deadly toxic gas called hydrogen sulfide gas, or H2S."
A spokesman for a company with exploratory wells in Michigan says the state has some of the most rigorous safety regulations in the nation for fracking.
Petition organizers must get more than 322,000 signatures by July 9, to get the issue on the November ballot.
