| Key points in a joint statement on global warming issued last week by 11 leading international science bodies, including the U.S. National Academy of Sciences: |
| Significant global warming is occurring. |
| It has caused increases in sea levels, retreats of glaciers and changes in many biological systems. |
| Most warming in recent decades can likely be attributed to human activities, largely from developed countries. |
| Action taken now to reduce the build-up of greenhouse gases will lessen the magnitude and rate of climate change. |
| Failure to implement reductions now will make the job more difficult in the future. |
| Source: U.S. National Academy of Sciences |
