The IPCC used this and other data gathered from fossil records, ice core drillings, tree ring analyses, marine sediment cores and the like to develop global weather models designed to account for past global temperature changes and predict future temperature scenarios. ... By examining various "proxies,"" such as tree rings and ice core drillings, scientists since 1990 have discovered that the increase in global surface temperatures over the last 100 years was not linear, but occurred mostly during the period 1900 to 1940, when there was negligible human induced CO2 activity. ... The ICPP'...

• Word Count: 2434
• Approx Pages: 10
• Grade Level: Undergraduate