Complex sentence: Furthermore, studies such as Christopher Weber's report on Food Miles have shown that the total amount of greenhouse gas emissions in production far outweighs those in transportation: which implies that locally grown food is actually worse for the environment than food made in factory farms.
Split into simpler sentences: Furthermore, studies, such as Christopher Webers report on Food Miles, have shown that the total amount of greenhouse gas emissions in the production phase far outweigh the emissions created in the transportation phase. In short, locally grown food is actually worse for the environment than food made in factory farms.