Sentences with phrase «significant anthropogenic influence on climate»

Regardless, even the IPCC concedes that there was no significant anthropogenic influence on climate prior to 1950, thus man is not be responsible for sea level rise beginning 150 - 200 years ago, at the end of the Little Ice Age.

Not exact matches

However, detection and attribution analyses based on climate simulations that include these forcings, (e.g., Stott et al., 2006b), continue to detect a significant anthropogenic influence in 20th - century temperature observations even though the near - surface patterns of response to black carbon aerosols and sulphate aerosols could be so similar at large spatial scales (although opposite in sign) that detection analyses may be unable to distinguish between them (Jones et al., 2005).

Significant questions about anthropogenic influences on climate remain.

In testimony before the US Senate in 2003, he stated: It is the consensus of the climate research community that the anomalous warmth of the late 20th century can not be explained by natural factors, but instead indicates significant anthropogenic, that is human influences... More than a dozen independent research groups have now reconstructed the average temperature of the northern hemisphere in past centuries... The proxy reconstructions, taking into account these uncertainties, indicate that the warming of the northern hemisphere during the late 20th century... is unprecedented over at least the past millennium and it now appears based on peer - reviewed research, probably the past two millennia.

These scientists have found that, in the absence of any significant CO2 concentration changes or human influence during the Holocene (i.e., the last ~ 10,000 years), the deep oceans naturally warmed by more than 2 °C in a span of just 200 years, which is several times the rate in which they are alleged to have warmed in the last ~ 60 years of the supposedly dominant anthropogenic influence on climate.