They need to hear from citizens and organisations around the world that bold action is needed to stop global warming. Their historic 1990 report predicted a rise in the average global temperature of 0.3 degrees Celsius per decade unless action is taken.
Climate change means much more than higher temperatures.
It will mean an increase in average global temperatures, but some regions will warm more than others. Impacts will vary considerably. Changing rainfall patterns will bring more droughts to some regins but more floods to others. Many plants and animals will face extinction. Global food production would be reduced.