Urban heat islands not responsible for global warming
During the past 100 years, the global average temperature has risen about 0.74 degrees Celsius (SN: 2/10/07, p. 83). Some scientists have blamed some, if not all, of that warming on urban heat islands, says David Lister, a climate scientist at the University of East Anglia in Norwich, England.
For instance, previous studies indicate that conditions in central London are, on average, 1.5 degrees Celsius warmer than those in undeveloped areas nearby. Likewise, a weather station in Vienna,