The scientists been taking the heat island effect into account the whole time. See box 2.1 here, it explains it quite well: http://www.grida.no/publications/ot

The scientists been taking the heat island effect into account the whole time. See box 2.1 here, it explains it quite well: http://www.grida.no/publications/other/ipcc_tar/?src=/climate/ipcc_tar/wg1/052.htm#2221 http://www.grida.no/publications/other/ipcc_tar/?src=/climat... In relation to the El Nino, sure, it is a factor in the heat every 5-7 years or so, including last year, but it doesn't explain the trend.