RSS feeds are summaries of news items, forums, blogs, or other website content. Each summary usually consists of a title, brief description, publication date and link to the actual article on-line.
Many websites and programs use RSS feeds to display the latest contents of your favourite sites, making it easy to spot new articles without having to visit each site in turn.
Unchecked emissions of greenhouse gases would create a much warmer world, according to a new computer analysis showing average surface temperature projections for the end of the century (left). The map at right projects temperature changes if emissions are cut by 70 percent. The numbers on the bar show changes in Celsius compared with today's average temperatures.