Now Playing: 12-04-12 Marketplace Morning Report

A new paper out claims that high frequency trading -- stock trades executed by computers at very high speeds -- may be taking money away from traditional investors. As 200 countries meet in Doha this week for the latest round of United Nations' climate change talks, new sources of fossil fuel are stirring up the climate change conversation.  And politicians across the Midwest are pressing the President to declare a state of emergency on the Mississippi River in order to allow barge traffic to keep flowing. An epic shortage of water in the Mississippi has put major pressure on everything from food items, to electricity.