evidence: The SPM also misleads when it states, "Warming of the climate system is unequivocal, and since the 1950s many of the observed changes are unprecedented." The NIPCC authors explain, "Though the IPCC’s favored temperature record (HadCRUT) depicts a rise of 0.4 deg. C since 1950, other temperature records show little or no warming at all in the second half of the twentieth century." These include the US GISS land surface record, sea surface temperature records, including Hadley NMAT, atmosphere temperature records, such as Hadley radiosonde and satellite MSU, and land surface temperature proxies. The NIPCC authors conclude in response to the SPM, "It is likely that the HadCRUT temperature record underestimates the impact of urban heat islands [in falsely exaggerating] surface temperature records….[Moreover,] the post-1950 warming shown by the Hadley record is of about the same magnitude and rate as the known natural warming between 1910 and 1940, and is therefore not unprecedented." [...] Among Climate Change Reconsidered II’s conclusions, "neither the rate nor the magnitude of the reported late twentieth century surface warming (1979-2000) lay outside natural variability, nor was it in any way unusual compared to earlier episodes in Earth’s climate history. Furthermore, solar forcings of temperature change are likely more important than is currently recognized, and evidence is lacking that a 2 degree C increase in temperature (of whatever cause) would be globally harmful."