Global warming has replaced the China Syndrome as the number one energy worry in the United States, and Cassini is delivering a whole world of new data on Saturn: rubble-pile moons, record-groove gaps in the planet's famous rings, complex weather systems churning through the pastel cloud cover, and possible explanations for the unrelenting 900-mile-an-hour winds. The still-active Cassini craft also has detected massive electrical storms with thunderheads as big as the entire Earth.