Sentences with phrase «unprecedented during the past century»

The model results and historical data suggest that this dramatic fall in primary productivity is unprecedented during the past century.

Not exact matches

Some experts claim the rise in temperature during the past century was «unprecedented» and proof that immediate action to reduce human greenhouse gas emissions must begin.

The sediment core proves that changes happening in the lake during the Twentieth Century are unprecedented over the past 200,000 years.

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.

The knowledge of climate and its variability during the past centuries can improve our understanding of natural climate variability and also help to address the question of whether modern climate change is unprecedented in a long - term context (Folland et al. 2001; Jansen et al. 2007; Hegerl et al. 2007; Mann et al. 2008 and references therein).