NYC exterminators' new weapon has eliminated nearly 100% of rats from over 100 burrows — and they already have their next targets mapped out

• New York City officials have found a new effective way to kill rats.
• The strategy involves pumping carbon monoxide directly into the rat burrows.
• Some rat researchers say the city should focus on human behavior, including improving waste disposal.

New York City officials have found a new way to kill rats that has all but eliminated a rat population on one Upper East Side street.