[Patrick Moore, Ph.D., has been a leader in international environmentalism for more than 40 years. He cofounded Greenpeace and currently serves as chair of Allow Golden Rice. Moore received the 2014 Speaks Truth to Power Award at the Ninth International Conference on Climate Change, July 8, in Las Vegas. Watch his presentation about this piece at the video player to the left.]
I am skeptical humans are the main cause of climate change and that it will be catastrophic in the near future. There is no scientific proof of this hypothesis, yet we are told “the debate is over” and “the science is settled.”
My skepticism begins with the believers’ certainty they can predict the global climate with a computer model. The entire basis for the doomsday climate change scenario is the hypothesis increased atmospheric carbon dioxide due to fossil fuel emissions will heat the Earth to unlivable temperatures.
In fact, the Earth has been warming very gradually for 300 years, since the Little Ice Age ended, long before heavy use of fossil fuels. Prior to the Little Ice Age, during the Medieval Warm Period, Vikings colonized Greenland and Newfoundland, when it was warmer there than today. And during Roman times, it was warmer, long before fossil fuels revolutionized civilization.
The idea it would be catastrophic if carbon dioxide were to increase and average global temperature were to rise a few degrees is preposterous.
Recently, the Intergovernmental Panel on Climate Change (IPCC) announced for the umpteenth time we are doomed unless we reduce carbon-dioxide emissions to zero. Effectively this means either reducing the population to zero, or going back 10,000 years before humans began clearing forests for agriculture. This proposed cure is far worse than adapting to a warmer world, if it actually comes about.
Human Emissions Saved Planet
Over the past 150 million years, carbon dioxide had been drawn down steadily (by plants) from about 3,000 parts per million to about 280 parts per million before the Industrial Revolution. If this trend continued, the carbon dioxide level would have become too low to support life on Earth. Human fossil fuel use and clearing land for crops have boosted carbon dioxide from its lowest level in the history of the Earth back to 400 parts per million today.
At 400 parts per million, all our food crops, forests, and natural ecosystems are still on a starvation diet for carbon dioxide. The optimum level of carbon dioxide for plant growth, given enough water and nutrients, is about 1,500 parts per million, nearly four times higher than today. Greenhouse growers inject carbon-dioxide to increase yields. Farms and forests will produce more if carbon-dioxide keeps rising.
We have no proof increased carbon dioxide is responsible for the earth’s slight warming over the past 300 years. There has been no significant warming for 18 years while we have emitted 25 per cent of all the carbon dioxide ever emitted. Carbon dioxide is vital for life on Earth and plants would like more of it. Which should we emphasize to our children?