Multitude of Additional Climate and Climate Related Changes Are Projected

In addition to increasing global average temperatures, a host of other climate variables are projected to experience significant changes over the 21st century, just as they have during the past century. For example, it is very likely8 that

• Heat waves will become more intense, more frequent, and longer lasting, while the frequency of cold extremes will continue to decrease;

• Snow and ice extent will continue to decrease;

• The intensity of precipitation events will continue to increase;

7 As discussed in Chapter 6, none of the scenarios considered in this modeling effort attempted to represent how climate policy interventions might influence future GHG emissions.

8 Estimated greater than 9 out of 10 chance (see Appendix D).

A1B: 2011-2030 __A1B: 2046-2065 __A1B: 2080-2099
A2: 2011-2030 A2: 2046-2065 A2: 2080-2099

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5 (°C)

FIGURE 2.5 Worldwide projected changes in temperatures, relative to 1961 -1990 averages, under three different emissions scenarios (rows) for three different time periods (columns). For further details see Figure 6.21. SOURCE: Meehl et al. (2007a).

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5 (°C)

FIGURE 2.5 Worldwide projected changes in temperatures, relative to 1961 -1990 averages, under three different emissions scenarios (rows) for three different time periods (columns). For further details see Figure 6.21. SOURCE: Meehl et al. (2007a).

• Glaciers and ice sheets will continue to melt; and

• Global sea level will continue to rise.

Many of these changes are discussed below and described in detail in Part II of the report.

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