Figure 2 illustrates the large year - to - year variation for five renewable energy areas from 1992 to 2008. (issues.org)
While some studies have shown changes in lightning associated with seasonal or year - to - year variations in temperature, there have been no reliable analyses to indicate what the future may hold. (sciencedaily.com)
The secret to the unique diversity of Lake Malawi's cichlid fish may be down to huge variations in climate and water levels over the years (newscientist.com)