What was the top environmental news story of 2004? If you listen to Sierra Club members, it was the rise of the Prius:
What cynics assumed would be a gimmick turns out to be a goldmine. Toyota has sold over a quarter million of its Prius sedan, a gas-electric hybrid, proving that this fuel saving technology is anything but a flash in the pan.
One environmental story that should be near the top of the list was the continued impovement of air quality throughout the US.
See "Smog hits a record low" for further info.