The mix of memoir and reporting is effective as the author seeks the middle ground reality between ‘natural’ and ‘industrial’, to get past the sound bites and the shouters. Part of what we learn is that this dichotomy itself is a pretty mushy one. For example vaccines are highly reliable and high tech, but with smallpox and polio what they do is restore the immunities urbanization and sanitation took away, ones we used to get from mom, dirt and cows. These are complex issues so no one book can cover all the bases, but there is enough substance here to make one rethink the conventional wisdom, presented in a gentle readable fashion (fans of This American Life or RadioLab will recognize the tone). Have a look.