NEW YORK -- NBC's three-hour primetime "Live Earth" special, which included highlights from Saturday's global concerts, failed to generate much enthusiasm in the ratings.

The estimated 2.7 million viewers was slightly under the 3 million viewers NBC has averaged on Saturday nights in the summer with repeats and the Stanley Cup hockey playoffs on what is already the least-popular night of television.

It also performed below the Live 8 concert two years ago, according to preliminary estimates released Monday by Nielsen Media Research.

The three-hour concert special from Giants Stadium in East Rutherford, N.J., drew a 0.9 rating/3 share in adults 18-49 --- the same as a typical summer Saturday after Memorial Day.

The special was also just under ABC's primetime coverage of the Live 8 concert, which occurred Independence Day weekend on July 2, 2005. Live 8 averaged 2.9 million viewers and a 1.0 rating/5 share in adults 18-49.