Earth Changes
Local officials called the quake moderate and said there were no reports of any damage.
The Tungurahua volcano, one of the most active volcanoes in Ecuador, started its second activity peak this May since the eruption process began in August 1999.
General Motors, Ford and DaimlerChrysler cars and light trucks emitted nearly three-fourths of all carbon dioxide from vehicles on U.S. roads in 2004, the year for which statistics were available, according to the watchdog group Environmental Defense.
The alert -- the second highest on a four-level scale -- was for Wednesday afternoon through to the early hours of Thursday.

Thousands more were ordered to leave their homes in New Jersey, New York and Maryland. Rescue helicopters plucked residents from rooftops as rivers and streams surged over their banks, washed out roads and bridges, and cut off villages in some of the worst flooding in the region in decades, with more rain in the forecast for the rest of the week.
More than 1,000 firefighters on Wednesday were battling dozens of fires, from a 57,000-acre blaze burning out of control largely in uninhabited rangeland in northeast Nevada to a complex of a dozen smaller fires around Reno and Carson City that forced evacuations at the town of Mound House along the historic Pony Express Trail.
Radio reports said residents of the southwestern city of Bandar Abbas poured into the streets after the quake hit.
The U.S. Geological Survey said the quake struck at 1:32 a.m. (local time) and had a magnitude of 5.6. It was centered about 35 miles southwest of Bandar Abbas or about 650 miles southeast of Tehran, the capital.
Several large federal offices remained closed. Local governments opened emergency command centers and sheltered more residents reeling from rains of historic magnitude. The silt-laden Potomac River neared flood stage, and other waterways verged menacingly on overflowing.
Fearing that Lake Needwood, north of Rockville, was breaching its leaking dam, Montgomery County officials early this morning began evacuating people living along Rock Creek below the dam, county spokeswoman Donna Bigler said.
Weather can have huge affects, from sinking a city to causing hillsides to slip away, but scientists say the weather might have an even larger impact - causing the whole planet to wobble.
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