Cities run up against regulations in an attempt to go green.
Oakland's Lake Merritt is overrun with defecating geese. Is the city missing the forest for the feces?
Marijuana is California's biggest dollar crop—and its production is stretching the North Coast's resources.
A Marxist geographer celebrates green activists. Lisa Owens Viani talks to Richard Walker.
What if we all disappeared one day? Linnea Due queries Alan Weisman.