Updating global address list in outlook

Projections using the SRES emissions scenarios suggest a further reduction in average global surface ocean p H of between 0.14 and 0.35 units over the 21st century.

The effects of ocean acidification on the marine biosphere have yet to be documented.

Evidence of global warming is shown in the graphs opposite.

Projections of future changes in precipitation show overall increases in the global average, but with substantial shifts in where and how precipitation falls.The last 800,000 years are expanded in the lower half of the figure (image credit: NASA).Seven of these indicators would be expected to increase in a warming world and observations show that they are, in fact, increasing.Authors of IPCC AR4 SYR (2007) were uncertain whether the increase in rate from 1993 to 2003 was due to natural variations in sea level over the time period, or whether it reflected an increase in the underlying long-term trend.There are two main factors that have contributed to observed sea level rise.