A large scholarship currently holds that before the onset of anthropogenic global warming,
natural climatic changes long provoked subsistence crises and, occasionally, civilizational …

Exceptional drought events, known as megadroughts, have occurred on every continent
outside Antarctica over the past~ 2,000 years, causing major ecological and societal …

2 Chapter 2 assesses observed large-scale changes in climate system drivers, key climate
indicators and 3 principal modes of variability. Chapter 3 considers model performance and …

Europe's recent summer droughts have had devastating ecological and economic
consequences, but the severity and cause of these extremes remain unclear. Here we …

Severe and persistent 21st-century drought in southwestern North America (SWNA)
motivates comparisons to medieval megadroughts and questions about the role of …

The AR5 concluded that human influence on the climate system is clear, evident from
increasing greenhouse gas concentrations in the atmosphere, positive radiative forcing …

Working Group I (WGI) of the Intergovernmental Panel on Climate Change (IPCC) assesses
the current evidence on the physical science of climate change, evaluating knowledge …

Higher evaporative demands and more frequent and persistent dry spells associated with
rising temperatures suggest that drought conditions could worsen in many regions of the …

As forest demographics are altered by the global decline of old trees and reforestation
efforts, younger trees are expected to have an increasingly important influence on carbon …

South American (SA) societies are highly vulnerable to droughts and pluvials, but lack of
long-term climate observations severely limits our understanding of the global processes …