In Saier's mind climate change, pollution and the rapid extinction of species on the entire planet are a large scale repetition of Easter Island's fate. So while he teaches the specifics of how humans impacted the environment, the facts speak for a normative conclusion. We bear the full guilt of the planet's impending collapse and radical change is needed to prevent disaster and contain the huge damage done already.
More Human and the Environment:
Defining Environmental History,
Climate Change will make us pay,
Electric Cars,
Good climate for everyone,
Lord Lawson and the alarmists,
Hot, Flat and Crowded,
Stern Review.