From The Pueblo Chieftain (Zach Hillstrom):
A Colorado expert on climate science will lead a virtual presentation Tuesday evening to discuss the science behind, impacts of, and solutions to address climate change.
Scott Denning, a professor of atmospheric science at Colorado State University who has authored more than 100 papers on the subject, will deliver remarks over Zoom as the keynote speaker for a virtual event celebrating the third anniversary of the Renewable Energy Owners Coalition of America.
REOCA, a 501(c)(4) nonprofit, formed in Pueblo in February 2018. Its mission is to “protect and promote distributed renewable energy resources for the economy, the environment and a sustainable future,” according to its website.
Denning’s Tuesday presentation will look at what he calls the, “Three S’s of climate change: simple, serious and solvable.”
“Simple is, ‘How does it work?’ Serious is, ‘Why is it bad?’ And solvable is, ‘What are you going to do about it?’” Denning said.
Although there are complex factors that contribute to an increasingly hotter climate, Denning said the phenomenon itself is simple.
“When you add heat to things, they change their temperature,” Denning said.
“This is pretty fundamental … You put a pot of water on the stove, you put heat into the bottom of the pot of water and lo and behold, it warms up. The Earth works exactly that same way. If more sun comes into the earth than heat radiation going out, then it warms up.”
Carbon dioxide (CO2) slows down outgoing heat from the earth. So the more CO2 there is on Earth, Denning said, the warmer it gets. And this poses a serious problem.
“Unless we stop burning coal, oil and gas, we’ll warm up the world 10 degrees Fahrenheit by the time our children today are old,” Denning said.
“And 10 degrees Fahrenheit is a lot. That’s like the difference between Denver and Rocky Mountain National Park, or the difference between Pueblo and somewhere down in southern New Mexico — it’s the kind of difference that you would absolutely notice.”
Denning said in the future, temperatures at the tops of mountains might be similar to current temperatures on the Colorado plains, which has drastic implications for farmers and ranchers.
In Colorado, some of the most serious impacts will affect the state’s water supply.
“Depending on where you are in the world, there are different kinds of climate problems. Our problem here is that we don’t have water to spare,” Denning said.
“In the Mountain West, we support our entire culture here on mountain runoff — on the snowmelt that comes down out of the mountains every spring and fills our reservoirs, and that’s where our cities get water and where our farmers get water,” Denning said.
“If we swap out the climate of Albuquerque or El Paso (Texas) for the climate of Pueblo, what’s the biggest thing people in Pueblo would notice? Well, besides the fact that it would be hot, you wouldn’t have enough water.”
Denning said the problem is not so much about water supply, but rather demand.
“When it’s hot in the summer, our lawns need more water, our crops need more water, our livestock need more water, our forests need more water,” Denning said.
“And this is a permanent change. If we turn up the thermostat to El Paso levels … people will have to live differently, very differently, than they do today in Colorado.”
But the positive news, and the third topic of Denning’s discussion, is that climate change is solvable.
“The solution is to stop setting carbon on fire,” Denning said.
“That means learning to live well with less energy and learning to make energy that doesn’t involve setting stuff on fire.
“That means (more energy efficient) houses and lights and cars and all that stuff, it also means using solar, wind, nuclear, hydro, whatever other kinds of energy that don’t involve burning things.”
Denning said people in 2021 are “very lucky” because sustainable sources of energy are “actually cheaper than the old-fashioned” energy sources.
“It’s hard to switch off fossil fuels, like it was hard to switch off of land lines. It’s hard to switch to clean energy, like it was hard to build the internet,” Denning said.
“It’ll cost us money. But just like mobile phones and the internet, switching our energy system will create jobs and prosperity for the next generation.
“This is basically just what we’ve been doing as a civilization since the end of the middle ages. We swap out old ways of doing things with new ways of doing things, and that’s why we have jobs.”
“So our kids’ generation will have jobs rolling out new infrastructure for generating energy that doesn’t cook the world.”
Denning’s presentation, as well as the rest of the REOCA anniversary celebration, can be viewed at 6 p.m. Tuesday evening by visiting http://reoca.org/event/celebrate-reocas-3rd-anniversary/.