BREAK THROUGH Environmental insiders Michael Shellenberger and Ted Nordhaus triggered a firestorm of controversy with their self-published essay, "The Death of Environmentalism."  In it, they argued that global warming is far more complex than past pollution problems. American values have changed dramatically since the environmental movement's greatest victories in the 1960s, yet environmentalists keep fighting the same battles without realizing that the battlefield has changed. Noting a connection between the failures of environmentalism and the failures of the entire left-leaning political agenda, the authors point the way toward an aspirational politics that will resonate with modern American values and be capable of tackling our most pressing challenges.