During nearly all of Earth’s history, carbon dioxide concentration was at many multiples of our current level, averaging 2,600 ppm, or 6.5 times our current measurement. Forerunners of most of the plants we rely on for sustenance first appeared around 150 million years ago when  levels were more than 2,000 ppm. Since that time  has fallen steadily and precipitously In fact, at the end of the last ice age, carbon dioxide reached the dangerously low level of 182 ppm, thought to be the lowest since the Pre-Cambrian time period more than 600 million years ago. Why is it dangerous? Because 150 ppm is the lowest level at which plant life can survive. We came within a whisker of breaching that ‘line of death.’ Until we began adding  to the atmosphere, there was no guarantee that this horrific threshold would not be crossed in the future Rather than spreading fear of increasing carbon dioxide, we should be thankful that both the Earth and humanity are thriving, in part due to more  … Although I do not pretend to speak for the planet’s flora, I am quite certain that, if plants had a say in the matter, they would not lobby for reductions in  levels. For plants,  is food. They need more of it, not less. 01 he jacket copy for Wrightstone’s newly-released book, titled “Inconvenient Facts: The Science that Al Gore doesn’t want you to know,” promoted the book as a response to Al Gore’s “An Inconvenient Truth” Gregory Wrightstone presents the science to assess the basis of the threatened Thermageddon. The book’s 60 “inconvenient facts” come from government sources, peer-reviewed literature or scholarly works, set forth in a way that is lucid and entertaining. The information likely will challenge your current understanding of many apocalyptic predictions about our ever dynamic climate. You will learn that the planet is improving, not in spite of increasing CO2 and rising temperature, but because of it. The very framework of the climate-catastrophe argument will be confronted with scientific fact.