Climate Change 2007: Impacts, Adaptation and Vulnerability, is the second volume of the IPCC Fourth Assessment Report. After confirming in the first volume on The Physical Science Basis that climate change is occurring now, mostly as a result of human activities, this volume illustrates the impacts of global warming already under way and the potential for adaptation to reduce the vulnerability to, and risks of climate change.
This volumes comprises the Working Group II contribution to the IPCC Fourth Assessment (AR4) and contains a Summary for Policymakers (also available here). a Technical Summary, the chapters of the Assessment and various annexes. The scope, content and procedures followed are described in the introduction of the report.
Drawing on over 29,000 data series, the current report provides a much broader set of evidence of observed impacts coming from the large number of field studies developed over recent years.
The report pays great attention to regional impacts and adaptation strategies, identifying the most vulnerable areas.
Observational evidence from all continents and most oceans shows that many natural systems are being affected by regional climate changes, particularly temperature increases
A global assessment of data since 1970 has shown it is likely that anthropogenic warming has had a discernible influence on many physical and biological systems.
Some large-scale climate events have the potential to cause very large impacts, especially after the 21st century.