3.5 miles (5.6 km)
5.6 Kilometers
under 3.5 miles
Frost
Carbon Dioxide (CO2) levels in the atmosphere in 1750 were between 275 and 280 ppm (parts per million). In 2012 they were 396 ppm. That is a percentage increase of more than 40%. (41.4%, 280 to 394; 43.2%, 275 to 394) See the co2now.org site below.
In a cool, dry atmosphere. Keep humidity above 50% and the temperature below 68 - 75F (20 - 24C).
5.6 Kilometers
The Republic Of Guyana
Almost 90 percent of the atmosphere's total mass is contained below 16 km. 99.999percent is below 100 km which is the Karman Line the demarcation which marks the beginning of space.
under 3.5 miles
7.46 miles approximately
Fifty Degrees Below was created in 2005.
Six percent is immediately reflected by the atmosphere.(Source: NASA.See the related question below.)
The breathable atmosphere only extends to about 7 or 8 kilometers (22,000 to 26,000 feet), and by the top of the stratosphere (50 km) is a near vacuum. The edge of space is commonly defined as 100 km (62 miles or 328,000 feet). The lowest stable satellite orbits are at 160 km (100 miles) above the Earth, but there are still occasional air molecules out as far as 600 km (373 miles).
The ISBN of the book "Fifty Degrees Below" by Kim Stanley Robinson is 978-0-553-58788-7.
Thirty-four of the fifty states currently have the death penalty, or 68%For more information about the death penalty in the United States, see Related Questions, below.
At all times (except during a solar eclipse), exactly 50% of the earth is illuminated by the sun and exactly 50% is not. (Actually the part that is illuminated is slightly more than 50% due to the refraction of sunlight in the atmosphere making the sun visible when it's just below the horizon.)
48 does.