State climatologist reacts to President Donald Trump’s decision to withdraw from Paris Climate Agreement

HUNTSVILLE, Ala. — President Donald Trump withdrew the United States from the Paris Climate Accord. In a news conference, the president said he is open to renegotiating aspects of the agreement. State Climatologist and UAH Professor John Christy tells WHNT News 19 with or without the U.S. participating, the numbers don't lie when it comes to the science of the agreement.

"I think if you look at the numbers, you can see a rational reason for such a decision. The calculations that we and others have done have shown that if the United States withdraws, then the effect by 2100 is less than 100th of a degree on the global temperature," Christy explained. He said that isn't even a measurable number.

"The fact the impact is less than 100th of a degree, you can see why someone would want to withdraw from an agreement. If it comes with the baggage of economic harm as well," Christy said.

The Paris Climate Accord is an agreement that 195 nations signed.

"The idea is to limit the production of greenhouse gases, particularly carbon dioxide," he said.

Christy said the theory is -- as humans produce more carbon dioxide emissions, then the world's climate is impacted. But there is disagreement about how large that impact is.

"There is evidence that the increase of carbon dioxide could have an effect on the global climate. Our research here shows the effect is going to be small if any, where others believe it could be large," Christy explained.

He said it doesn't matter if you believe humans affect the climate or not. Christy says his research on the impact of the Paris Climate Accord reveals it doesn't make a difference if the United States is in the agreement or not, as it relates to the science.

"We cannot tell the difference in terms of how we measure the global temperature. We measure the temperature everyday here. The amount or the effect of the U.S. in or out of the treaty is negligible," Christy said.