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- CFCs were only in commercial use for a few decades before an enormous hole was created in the ozone layer
- The atmospheric concentration of greenhouse gases has increased by approximately one third since the start of the industrial revolution. By the end of the 21st century the concentration is projected to be 3-4 times preindustrial levels
- X percent of global forests have been harvested in the last 200 years; only X percent of preindustrial levels remain
- Harvests from global fisheries have increased Xfold since the introduction of industrial fishing techniques
- (See Areas of Concern, Economic Drivers for a more complete list of these specific proximal drivers of material throughput).
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