TORONTO: Scientists have discovered a long-lived manmade greenhouse gas that appears to have the highest global-warming impact of any compound to date.
Radiative efficiency describes how effectively a molecule can affect climate. This value is then multiplied by its atmospheric concentration to determine the total climate impact . Researchers used the radiative efficiency of CO2 as a baseline for their comparison. Carbon dioxide is used as the baseline for comparison since it is the most important greenhouse gas responsible for human-induced climate change.
"PFTBA is extremely longlived in the atmosphere and it has a very high radiative efficiency ; the result of this is a very high global warming potential . Calculated over a 100-year timeframe, a single molecule of PFTBA has the equivalent climate impact as 7,100 molecules of CO2," said researcher Angela Hong. PFTBA has been in use since the mid-20 th century for various applications in electrical equipment and is currently used in thermally and chemically stable liquids marketed for use in electronic testing and as heat transfer agents. It does not occur naturally.
Source: The Times of India, 11 December 2013