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The annual fuel utilization efficiency (AFUE; pronounced 'A'-'Few' or 'A'-'F'-'U'-'E') is a thermal efficiency measure of space-heating furnaces and boilers.The AFUE differs from the true 'thermal efficiency' in that it is not a steady-state, peak measure of conversion efficiency, but instead attempts to represent the actual, season-long, average efficiency of that piece of equipment ...
A coal seam-fueled eternal flame in Australia known as "Burning Mountain" is claimed to be the world's longest burning fire, at 6,000 years old. [42] A coal mine fire in Centralia, Pennsylvania, has been burning beneath the borough since 1962. A coal field fire in Jharia, Jharkhand, India, is known to have been burning for almost a century.
There are challenges in comparing life expectancies across countries due to disparities in data reporting and collection standards. The primary source of the most recent data presented is the World Bank Group's 2022 report.
Carbon dioxide is 53% more dense than dry air, but is long lived and thoroughly mixes in the atmosphere. About half of excess CO 2 emissions to the atmosphere are absorbed by land and ocean carbon sinks. [16] These sinks can become saturated and are volatile, as decay and wildfires result in the CO 2 being released back into the atmosphere. [17]
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