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Global change: state of the science
D J Wuebbles1, A Jain, J Edmonds
1Department of Atmospheric Sciences, University of Illinois, Urbana, IL 61801, USA. wuebbles@atmos.uiac.edu
Environmental Pollution (Barking, Essex : 1987)
|April 20, 2004
Summary
Human activities impact the global environment, affecting the ozone layer and climate. While ozone is recovering due to policy, greenhouse gas emissions pose complex challenges for future climate projections and human welfare.
Area of Science:
- Environmental Science
- Atmospheric Chemistry
- Climate Science
Background:
- Human activities have been recognized as significant drivers of global environmental change in recent decades.
- Early 1980s atmospheric measurements confirmed human impact on the ozone layer, linked to stratospheric chlorine and bromine increases.
- International policy agreements led to a peak in ozone-depleting compounds in 1994, initiating ozone layer recovery.
Purpose of the Study:
- To evaluate the current scientific understanding of global environmental change.
- To assess the potential impacts of global change on human welfare and the planet.
- To examine the relationship between scientific understanding and policy considerations regarding global change.
Main Methods:
- Analysis of atmospheric measurements and theoretical studies on ozone depletion.
- Evaluation of scientific literature on greenhouse gas emissions and climate change.
- Review of policy implications related to scientific findings on global environmental issues.
Main Results:
- Observed ozone layer changes are clearly linked to human-induced increases in stratospheric chlorine and bromine.
- Global ozone-depleting compound abundances peaked in 1994, with the ozone layer beginning a slow recovery.
- The complexity of greenhouse gas-climate interactions limits definitive future climate change projections, though significant impacts are anticipated.
Conclusions:
- Effective international policy can address environmental issues like ozone depletion.
- Increasing greenhouse gas levels present a more complex challenge with potentially severe impacts on global welfare.
- Bridging scientific understanding and policy is crucial for addressing global environmental change effectively.