7 SIMPLE PROOFS OF CLIMATE CHANGE (Part 1)
7 ways to shut down a climate change denier; Comprehensive rebuttals to contrarians' pseudo-scientific explanations why global warming is just a myth (continued below)
John Rennie, December 18, 2013 (Scientific American)
[Challenge 1:] "...Anthropogenic CO2 can’t be changing climate, because CO2 is only a trace gas in the atmosphere and the amount produced by humans is dwarfed by the amount from volcanoes and other natural sources. Water vapor is by far the most important greenhouse gas, so changes in CO2 are irrelevant..." -- "...[Even at] 0.04 percent of the atmosphere], CO2 absorbs infrared radiation and acts as a greenhouse gas…[H]uman activity is by far the largest contributor…more than 130 times as much as volcanoes produce…95 percent of the releases of CO2 to the atmosphere are natural…[but they] pull the gas back out of the atmosphere and almost precisely offset them…[H]uman additions [are] a net surplus…As the temperature rises, more water vapor enters the atmosphere and multiplies CO2′s greenhouse effect…"
[Challenge 2:] "...The alleged “hockey stick” graph of temperatures over the past 1,600 years has been disproved. It doesn’t even acknowledge the existence of a “medieval warm period” around 1000 A.D. that was hotter than today is. Therefore, global warming is a myth..." -- "...[A] new research paper by Mann and his colleagues seems to confirm that the Medieval Warm Period and the ‘Little Ice Age’ between 1400 and 1700 were both caused by shifts in solar radiance and other natural factors that do not seem to be happening today…[and] the recent rapid rise in CO2 explains the current episode of warming more credibly than any natural factor does…[and] no natural factor seems poised to offset further warming in the years ahead…” click here for more