Warming of the coldest winter air masses has reduced overall temperature variability.
Streamflow records indicate decreased drought and no change in floods.
Heat-related deaths at high effective temperatures declined in northern cities. Finally, no known mechanism can stop or even significantly reduce global warming in the foreseeable future. Even with full compliance, international agreements, such as the Kyoto Protocol to the United Nations Framework Convention on Climate Change, would have no detectable effect on average temperature within a reasonable time frame of 50 years. Beyond 50 years, we have little, if any, idea what the energy infrastructure of our society will be.