In addition, the panel believes that substantial mitigation can be accomplished at modest cost. In other words, insurance is cheap. A supplementary IPCC report updating its 1990 study finds that new research confirms the general conclusions of its earlier study. However, the report notes that reflection of sunlight by particulates may be offsetting some greenhouse warming in the Northern Hemisphere. The UN Framework Convention on Climate Change is signed by 155 nations at the Rio Earth Summit.
Efforts are currently underway to implement and strengthen it worldwide.
The year 1995 matches 1990 as the hottest year on record. Global temperature data indicates that 1998 is the warmest year of the last century based on thermometer readings and likely the warmest of the last millennium based on proxy temperature data.