A new study has found that rat populations have spiked in cities with warming temperatures resulting from climate change. The lead author of that study, University of Richmond associate professor Jonathan Richardson,

Rat populations are growing out of control in cities across the United States and the problem is only going to get worse unless something is done. Because

Rat populations are growing in cities around the world because of climate change. A new study explains why this is happening now and what we can do about it.

As CBS News New York's Vanessa Murdock reports, the Big Apple isn't the only city struggling with this problem.

The Washington Post reports that rat populations in urban areas are increasing worldwide, largely because of climate change. Researchers came to this conclusion after studying 16

The study did not count rats directly; instead, it analyzed rat sighting complaints submitted by city residents.