| The tired old global warming, and greenhouse gas bogeymen have also been raised. |
| The technique can monitor other pollutants including dust particles or nitrogen dioxide, a greenhouse gas that is produced in car exhaust. |
| So a switch to coal would increase the greenhouse gas effect of fossil fuel usage. |
| Instead it plans to purchase quotas of greenhouse gas emission from poorer and less industrialized countries. |
| How much do the eco-nuts think we have to cut greenhouse gas emissions and water consumption? |
| The stratosphere is rich in ozone, a greenhouse gas that filters out dangerous solar particles such as ultraviolet light. |
