On April 18th I attended a lecture titled "Climate Change at a Crossroads: An Update on Al Gore's Inconvenient Truth" by David Rhynas at the Sunnyside Branch of the Ottawa Library. I was disappointed to see that there was almost no science presented, that the science referenced was badly out of date, poorly referenced and explained only superficially. I will explain with a few examples and references.
The presenter started off with a very apropos quote from Mark Twain: "It ain't what you don't know that gets you into trouble. It's what you know for sure that just ain't so." Since Al Gore and his ilk claim the science is settled and almost no reputable scientist disagrees, his positions would fit into the latter part of Twain's quote, meaning they just ain't so.
Claim 1: CO2 is the predominant greenhouse gas. This just ain't so because water vapor is the greenhouse gas with the highest concentration. The concentration of CO2 is presently about 0.00038 and has been rising slowly. The concentration of water vapor varies with location and weather but is 20 to 120 times higher. Unfortunately, the climate alarmists usually dismiss water vapor since it is not seen as a man-made gas, but research in the last decade has shown a crucial role for water and clouds in regulating the climate cycle - a role that is actually the opposite of what some earlier researchers thought. A recent mathematical discovery indicates that CO2 is actually irrelevant to global temperature since water vapor adjusts in a natural feedback to balance changes in CO2.
Claim 2: Greenhouse gases are pollution. This is clearly wrong if CO2 is to be labeled as the predominant culprit, since CO2 is essential for all life on Earth and in history life thrives when the concentration of CO2 rises. CO2 is an essential nutrient for plants and all higher forms of life rely on plants for their existence. Eliminating CO2 from Earth's atmosphere would kill almost all life forms, humans included.
Claim 3: CO2 causes the Earth's temperature to rise, as indicated by hundreds of thousands of years of ice core data. While some scientists initially looked at data from the Vostok ice core and saw the rise and fall of temperature and CO2 as one where CO2 causes temperature to change, subsequent analysis with higher resolution of time has identified other possible conclusions. The data below was presented by Gore and in this presentation by Rhynas, as two lines on two graphs. When you superimpose them, it becomes apparent that temperature change often leads CO2 change.
Claim 4: Global temperature was stable for hundreds of years and then rose rapidly in the last 150 years. This is known as Michael Mann's hockey stick graph and has been thoroughly examined and disproven almost since the time it was first published. Mann not only used incomplete and selective data but used a flawed mathematical model that had to produce the hockey stick effect.