Which of the following statements are correct?
1. Global temperature has risen by 1 degree Fahrenheit (0.5 degree C) over the last 100 years.
2. Most of global warming over the last 100 years occurred before 1940.
3. The earths mean surface temperature as measured by satellite has not risen since 1998.
4. CO2 is one reason why temperature of the earth changes, but is not the only reason.
5. The idea that CO2 causes climate change is a theory, not a fact.
6. The total polar bear population is now the largest it has been in 25 years.
7. Hurricanes are not caused by global warming.
8. No reliable earth temperature data exists before app. 1850 – all estimates
of temperature before 1850 are just that: estimates.
9. There is no significant relationship between local temperatures (e.g. the temperature in the United States) and global atmospheric temperature or global earth temperature.
10. CO2 levels are currently lower than they have been in the past.
11. Current earth surface temperatures are cooler now than at several periods in the past.
12. Increases in sea levels are a natural part of nature – current scientific estimates are that the sea level will rise by (app.) 4 inches over the next 100 years.
13. The IPCC does not predict temperatures and ocean levels, it simply provides scenarios of the future based on computer models.
14. The North West Passage has been open to shipping several times in the past. – e.g. 1903-5, 1940-2 and 1944.
15. Measures of the surface of Mars shows a similar rise in temperature to that of the earth – Mars has no man made CO2.
16. 2008 saw the most rapid growth in Arctic ice cover in that same period and Arctic ice cover is now back to the average it has had throughout the period the coverage has been monitored by satellites.
17. Just 52 scientists acted as authors on the 2007 UN IPCC report on climate change – over 650 (including several of the original UN IPCC scientists) have signed a petition objecting to the findings of the 2007 report.
18. The first half of 2008 was the coolest for at least five years.
19. Arctic ‘warmings’ have taken place before, and are recorded for the 1800s, for the 1930s, and for the 1950s. Current warming in Greenland does not appear to have reached the levels of these earlier events
20. Changes in the major ice shelves do not contribute to a rise in sea levels - sea level rises or falls very slowly and completely irrespective of how much warming or cooling is taking place.
All of these statements can be verified as correct.