Yesterday, I wrote about two of the biggest ecological challenges we face, both caused directly by agricultural practices, and both driven by the U.S. appetite for cheap food. Factory farming and its effect on oceans was the focus of yesterday’s blog post. Today, I will examine a vital collection of forests that are literally losing ground to the raising of one small (in size) but significant (in sales) crop: shrimp. In South America and Southeast Asia, mangrove forests once lined the coasts. Mangroves are amazing trees. These salt-tolerant plants grow directly in the ocean, sinking a thicket of aerial roots into inter-tidal areas. The roots trap sediments and protect the shoreline from the battering waves of tropical storms.