My month with chemtrails conspiracy theorists

Tammi Riedl and her partner believe 'chemtrails' are damaging our health. They prove conspiracies have gone mainstream - and aren't just for the right wing

Standing between beds of golden beets and elephant garlic in the garden of Lincoln Hills, a small organic farm in Placer County, California, Tammi Riedl looks up and points to a stripe of white haze running across a cloudless blue sky.

"See that?" she asks, raising her eyebrows. "What do you think that is?"