Flooding in Venice

I just saw this story about flooding in Venice.

My first reaction was: "No! Wait! I haven't gotten there and seen Venice yet!" It reminded me of when the news hit about Hurricane Katrina in 2005. I was devastated, but glad I had gotten the opportunity to travel and see New Orleans before the storm tore it apart.

Then, I wanted to know why Venice is having its worst flooding in more than two decades. The story didn't really answer that question.

Is global warming to blame? Something else?

What do you think?