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Which of these vehicles is a "hybrid" in name only?
Carbon dioxide (CO2) levels in the atmosphere are higher today than they have been for at least:
In the United States, antibiotics are mostly used to treat people suffering from bacterial diseases.
Producing 20 percent of U.S. electricity from renewable sources would reduce pollution as much as taking how many cars off the road?
Known for clogging pipes and changing water quality in the Great Lakes region, how many invasive zebra mussels can cover one square meter:
Today's typical nuclear warhead is twice as destructive as the one dropped on Hiroshima.
The Union of Concerned Scientists (UCS) gave which of these agencies an above average grade for allowing its scientists to speak freely about their research with the press?