To would-be transport secretaries: According to official advice, new roads tend to generate more traffic. How large would your road-building programme be?
To shadow trade and industry ministers: Free trade and endless economic growth are ruining the planet. What is your alternative?
To defence spokesmen (spokeswomen are never allowed this brief): Does your defence policy rely on weapons of mass destruction, which would devastate the environment as well as humans?
To aspiring prime ministers: What is your number-one priority?
Green Party candidate, Ludlow constituency