Bloomberg quotes Morano: "The Earth has had many-times-higher levels of CO2 in the past. Americans should welcome the 400 parts-per-million threshold. This means that plants are going to be happy, and this means that global-warming fearmongers are going to be proven wrong"

Greenhouse Gases Hit Threshold Unseen in 3 Million Years - Bloomberg

“We are in the process of creating a prehistoric climate that humans have no evolutionary experience of,” Bob Ward, policy director at the Grantham Research Institute on Climate Change and the Environment at the London School of Economics, said in a telephone interview.
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Carbon permits traded on the EUETS closed down 41 cents at 3.38 euros ($4.38) a ton today. Analysts such as David King, former chief science adviser to the U.K. government, have said industry won’t eliminate carbon for less than 100 euros a ton.
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Carbon dioxide can stay in the atmosphere for as much as a century  [Wait, what happened to CO2 lingering for millenia?], so levels now may cause warming for decades.
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“There is no doubt that the average global temperature will continue to increase,” Joanna Haigh, a professor of atmospheric physics at Imperial College London, said in an e-mailed statement.
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“The Earth has had many-times-higher levels of CO2 in the past,” said Marc Morano, former spokesman for Republican Senator James Inhofe and executive editor of Climate Depot, a blog that posts articles skeptical of climate change. “Americans should welcome the 400 parts-per-million threshold. This means that plants are going to be happy, and this means that global-warming fearmongers are going to be proven wrong.”
That position is disputed by many researchers, said Melanie Fitzpatrick, climate scientist at the Union of Concerned Scientists.
“This needs to be a wake-up call,” she said in a statement. “Reaching 400 parts per million represents a dire experiment with the climate system.