Meat

There are a number of companies now working to 3-D print food.  The goal is a home meat printer—what kind of meat would you like tonight?  This would make a large positive impact on the environment.  

http://www.washingtonpost.com/blogs/wonkblog/wp/2015/05/20/meet-the-future-of-meat-a-10-lab-grown-hamburger-that-tastes-as-good-as-the-real-thing/