invasive species

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No, Wikipedia, the World Is Not Overrun With Sewer Rats

Debunking the total-world-domination myth of the common rat.

Reuters

Here's a Reason Not to Hate the Polar Vortex

 It’s killing some of the nastiest invasive insects around.

Shutterstock.com/Vaclav Volrab

Yes, There's a War on Swans

One of our more attractive invasive species is finally coming under fire.

Christoffer Hansen Vika/Shutterstock.com

A Century Later, the Expensive Lesson of Reversing the Chicago River

Running the numbers on a proposal to separate the Great Lakes and the Mississippi River.

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You'd Better Not Be Caught With Long Hair in Gaza

Also, politicians in Racine ban weapons (except for their own) and New York battles a slimy lake menace.

Reuters

You Didn't Plant That: Where Urban Trees Really Come From

Most city trees aren't the result of tree-planting programs.

Flickr/USACEpublicaffairs

Just 20 Fish Could Overtake the Great Lakes

How a small population might lead to big problems for a $7 billion fishing industry.