CITY HALL -- The city wants to spend big so there's no bang for Staten Island's bucks.

Comptroller Scott Stringer is allowing the city to fast-track the contracting process on a $2 million plan to perform vasectomies on the borough's male deer.

"On Tuesday, the Comptroller's office gave approval for the Parks Department request to use an emergency procurement to initiate a three-year sterilization study of deer on Staten Island," spokesman Eric Sumberg said.

The city charter allows the comptroller's office to approve emergency contracting when there's a threat to life, safety or property.

An unrestrained and expanding deer herd can harm parks and private property, spread tick-borne illness and wander into roads more often, increasing the risk for deadly vehicle collisions.

A 2014 aerial survey found 763 deer in Staten Island's green spaces, though some ecologists believe there may be more than 1,000 here now. The city surveyed the entire borough earlier this year and sterilizations are expected to begin in September.

The work can begin even before the comptroller's office reviews and approves the city's chosen contractor, a wildlife conservation nonprofit called White Buffalo Inc. that has used sterilization on deer populations in the past.

If the city's plan works, all male deer roaming the borough would be sterilized starting with a $2 million effort during this fall's rutting season. Hundreds of bucks would be tranquilized, captured, given vasectomies and released back onto Staten Island parkland over the course of the three-year study.

CITY: IT'S FASTEST, MOST HUMANE APPROACH

Mayor Bill de Blasio and other city officials have agreed that this is the fastest and most humane way to limit further growth of the Island's potentially dangerous white-tailed population.

But several wildlife experts think the plan won't work because the city is ignoring basic deer biology and conventional herd management practices. Some called the proposal "really stupid" and "incredibly foolish."

They also said sterilizing male deer may even make the problem worse because females would go into heat several times a year, creating a chaotic mating season.

The comptroller's office stressed that approval of the city's emergency procurement method isn't an endorsement of the vasectomy plan. The office doesn't judge the merits of the city's approach.

"We are pleased that this is moving forward in a timely manner, and that Staten Islanders will see the initial implementation of this smart, effective plan later this year," City Hall spokeswoman Natalie Grybauskas said.

The state Department of Environmental Conservation, which regulates wildlife, must also approve the city's sterilization plan. The agency doesn't recommend fertility control programs to mange deer populations because of their "limited effectiveness" and "inability to quickly reduce deer-human conflicts."

Fertility control like the sterilization plan is only permitted by the state as part of a scientific study. The city's three-year study is unprecedented in both scope and method.