 |
|
|
|||||
You might not know it from the headlines, but there is some good news about the global fight against climate change. A decade ago, the cheapest way to meet growing demand for electricity was to build more coal or natural gas power plants. Not anymore. Solar and wind power arent just better for the climate; theyre also less expensive today than fossil fuels at utility scale, and theyre less harmful to peoples health. Yet renewable energy projects face headwinds, including in the worlds fast-growing developing countries. I study energy and climate solutions and their impact on society, and I see ways to overcome those challenges and expand renewable energybut it will require international cooperation. Falling clean energy prices As their technologies have matured, solar power and wind power have become cheaper than coal and natural gas for utility-scale electricity generation in most areas, in large part because the fuel is free. The total global power generation from renewable sources saved $467 billion in avoided fuel costs in 2024 alone. As a result of falling prices, more than 90% of all electricity-generating capacity added worldwide in 2024 came from clean energy sources, according to data from the International Renewable Energy Agency. At the end of 2024, renewable energy accounted for 46% of global installed electric power capacity, with a record 585 gigawatts of renewable energy capacity added that yearabout three times the total generating capacity in Texas. window.addEventListener("message",function(a){if(void 0!==a.data["datawrapper-height"]){var e=document.querySelectorAll("iframe");for(var t in a.data["datawrapper-height"])for(var r,i=0;r=e[i];i++)if(r.contentWindow===a.source){var d=a.data["datawrapper-height"][t]+"px";r.style.height=d}}}); Health benefits of leaving fossil fuels Beyond affordability, replacing fossil fuels with renewable energy is healthier. Burning coal, oil, and natural gas releases tiny particles into the air along with toxic gases; these pollutants can make people sick. A recent study found air pollution from fossil fuels causes an estimated 5 million deaths worldwide a year, based on 2019 data. For example, using natural gas to fuel stoves and other appliances releases benzene, a known carcinogen. The health risks of this exposure in some homes has been found to be comparable to secondhand tobacco smoke. Natural gas combustion has also been linked to childhood asthma, with an estimated 12.7% of U.S. childhood asthma cases attributable to gas stoves, according to one study. Fossil fuels are also the leading sources of climate-warming greenhouse gases. When theyre burned to generate electricity or run factories, vehicles, and appliances, they release carbon dioxide and other gases that accumulate in the atmosphere and trap heat near the Earths surface. That accumulation has been raising global temperatures and causing more heat stress, respiratory illnesses, and the spread of disease. Electrifying buildings, cars, and appliances, and powering them with renewable energy reduces these air pollutants while slowing climate change. So whats the problem? In spite of the demonstrated economic and health benefits of transitioning to renewable energy, regulatory inertia, political gridlock, and a lack of investment are holding back renewable energy deployment in much of the world. In the United States, for example, major energy projects take an average of 4.5 years to permit, and approval of new transmission lines can take a decade or longer. A large majority of planned new power projects in the U.S. use solar power, and these delays are slowing the deployment of renewable energy. The 2024 Energy Permitting Reform Act introduced by Senators Joe Manchin, a Democrat from West Virginia, and John Barrasso, a Republican from Wyoming, to speed approvals failed to pass. Manchin called it just another example of politics getting in the way of doing whats best for the country. window.addEventListener("message",function(a){if(void 0!==a.data["datawrapper-height"]){var e=document.querySelectorAll("iframe");for(var t in a.data["datawrapper-height"])for(var r,i=0;r=e[i];i++)if(r.contentWindow===a.source){var d=a.data["datawrapper-height"][t]+"px";r.style.height=d}}}); An een bigger challenge faces developing countries whose economies are growing fast. These countries need to meet soaring energy demand. The International Energy Agency expects emerging economies to account for 85% of added electricity demand from 2025 through 2027. Yet renewable energy development lags in most of them. The main reason is the high price of financing renewable energy construction. Most of the cost of a renewable energy project is incurred up front in construction. Savings occur over its lifetime because it has no fuel costs. As a result, the levelized cost of energy for those projects varies depending on the cost of financing to build them. The chart shows what happens when borrowing costs are higher in developed countries. It illustrates the share of financing in each projects levelized cost of energy in 2024 versus the weighted average cost of capital. The yellow dots are solar projects; black and gray are offshore and onshore wind. [Chart: adapted from the International Renewable Energy Agencys Renewable power generation costs in 2024 report, CC BY 4.0] In many developing countries, wind and solar projects cost more to finance than coal or gas. Fossil projects have a longer history, and financial and policy mechanisms have been developed over decades to lower lender risk for those projects. These include government payment guarantees, stable fuel contracts, and long-term revenue deals that help guarantee the lender will be repaid. Both lenders and governments have less experience with renewable energy projects. As a result, these projects often come with weaker government guarantees. This raises the risk to lenders, so they charge higher interest rates, making renewable projects more expensive upfront, even if the projects have lower lifetime costs. To lower borrowing costs, governments and international development banks can take steps to make renewable projects a safer bet for investors. For example, they can keep energy policies stable and use public funds or insurance to cover part of the lenders investment risk. When investors trust theyll get paid, interest rates drop dramatically and renewable energy becomes the cheaper option. Without international cooperation to lower finance costs, developing economies could miss out on the renewable-energy revolution and lock in decades of growing greenhouse gas emissions from fossil fuels, making climate change worse. The path ahead To avoid the worst effects of climate change, countries have agreed to cut their greenhouse gas emissions over the next few decades. Achieving this goal wont be easy, but it is significantly less difficult now that renewable energy is more affordable over the long run than fossil fuels. Switching the worlds power supply to renewable energy and electrifying buildings and local transportation would cut about half of todays greenhouse-gas emissions. The other half comes from sectors where it is harder to cut emissionssteel, cement, and chemical production, aviation and shipping, and agriculture and land use. Solutions are being developed but need time to mature. Good governance, political support, and accessible finance will be critical for these sectors as well. The transition to renewable energy offers big economic and health benefits alongside lower climate risksif countries can overcome political obstacles at home and cooperate to expand financing for developing economies. Jay Gulledge is a visiting professor of practice in global affairs at the University of Notre Dame and the University of Tennessee. This article is republished from The Conversation under a Creative Commons license. Read the original article.
Category:
E-Commerce
Pittsburgh International Airport (PIT) was never really meant to serve Pittsburgh. When the modern airport opened in 1992, it was built as a hub for U.S. Airways, primarily serving as a connection point for passengers heading elsewhere. Tens of millions of passengers used PIT annually, though only a small number of them were actually flying into or out of Greater Pittsburgh. Most stayed in the terminal, leaving one gate only to enter another, which was fineuntil it wasn’t. “In 2004, the hub went away. Passengers plummeted. All those connecting passengers left,” says Christina Cassotis, who came on as CEO of the Allegheny County Airport Authority in 2015. After years of waiting for the hub, or any hub, to return, the airport authority decided it was time to accept that what PIT had become is an airport meant for people flying into or out of Pittsburgh. “We needed the facility to match the business plan,” Cassotis says. [Photo: Ema Peter] This month, more than 20 years after the U.S. Airways hub left town, Pittsburgh is opening a new $12.7 billion airport terminal building that embraces its status as an origin-and-destination airport, and one that puts its local passengers first. Designed by Gensler and HDR in association with Luis Vidal + Architects, the new PIT landside terminal where passengers arrive and check in to their flights is a grand and welcoming entry hall with light flooding through from all sides. It’s essentially a canopy of a building, with a soaring and undulating roof overhead. Slits in its wavy top bring light in and offer views to the skies outside while subtly directing travelers through the security checkpoint and to their gates. [Photo: Ema Peter] Rooted to the region Pittsburgh’s airport design concept came from Luis Vidal + Architects, known for its work on airports including London’s Heathrow Airport Terminal 2 and Boston’s Logan Airport Terminal E. “It was very obvious the hub was never coming back and this was going to be a destination and origin or an origin and destination. That’s the first clue for this design,” Vidal says. “It’s going to be for the place. It’s going to be rooted to the region, to the city, to its people.” [Photo: Ema Peter] Vidal says the concept was intended to reflect what he calls Pittsburgh’s virtues: nature, technology, and community. This is most obvious in the roof, with a curvaceous form that was inspired by the region’s rolling and forested hills. The roof’s hilly forms roll alongside each other, creating space for light to pour down into the building. Vidal says the effect is akin to taking a walk in a forest. “You see pockets of light coming down through the trees and the trunks,” he says. [Photo: courtesy Allegheny County Airport Authority] In this case, the trunks are massive branching steel supports that hold up the roof, powder coated in bronze and poking through the pale wood ceiling. It’s not as fully organic as the recently completed mass timber terminal at Portland International Airport, but the effect is a much calmer setting than conventional terminals that are strong-armed with hard gray concrete and steel. The connection to nature in Pittsburgh’s airport design goes even deeper. Around the terminal building’s sides and in the negative space before it connects with the airport’s X-shaped concourse, large landscaped open spaces are available for travelers and airport staff alike. Two are positioned on the landside, and accessible to the public. [Photo: courtesy Allegheny County Airport Authority] Two others are on the airside, past security, and offer a rare space for airport travelers to access fresh air in an almost park-like setting. In contrast to other airports, where outdoor space is small, if it is available at all, PIT’s outdoor terraces make up more than two acres. It’s an amenity that had no small cost, and one that almost got abandoned in the evolution of the design from a concept in 2018 to a completed project in 2025. “We had actually value-engineered that out,” Cassotis admits. “We were like, we can’t do this.” But the pandemic changed minds at the airport, and there was a renewed recognition that access to the outdoors and fresh air would be a benefit to all airport users. “It really became clear to us that we needed to do this and we needed it to be available to everybody,” Cassotis says. The airport declined to disclose how much the terraces cost. The terraces are also designed to work around Pittsburgh’s sometimes volatile weather. Carolyn Sponza, a studio director in Gensler’s Pittsburgh office, says the architects worked to ensure that at least one of the terraces would be accessible year-round, no matter the weather. “Part of that design process was working with the maintenance staff to locate every single piece of equipment they needed to make sure that the walkways were clear, and laying it out in a maintenance room with the hose bed next door,” she says. [Photo: Ema Peter] It’s one of the side benefits of working on an airport like Pittsburgh’s as it transforms from a major hub to a more modest origin-and-destination airport. “A lot of the places that we work in the United States, we’re trying to fix the airports or bring them into this century, but they’re space constrained,” Sponza says. “One of the unique things that this airport had was the ability to dream big and set the vision, and not just try to incrementally fix what was there before.” As Pittsburgh’s airport design officially opens to the public, the redesign is about right-sizing a facility for its actual needs, but also about resetting the expectations of the locals who’ll be its primary users. Rather than brooding as many have for many years over the U.S. Airways hub leaving the airport, the new terminal is a chance to start again. [Photo: Ema Peter]
Category:
E-Commerce
AI has a writing style, or, at least, an alleged style. Tools like ChatGPT and Claude seem to communicate with a tendency toward formalism. The chatbots are earnest, sometimes too evenhanded or overly complimentary. Theres a noticeable lack of personal flair, and no deeply held opinions. According to Grammarly, AI language tends to evoke “repetitive phrasing and robotic tone. Now, there are even AI buzzwords and phrases like pivotal and delve into and underscore. Its the verbiage of instruction booklets for middle schoolers writing their first essays. In the age of AI, these helpful crutch words are now verbata non grata. Some people are now trying to avoid using these terms, because they sound like a lowly bot God forbid. But the problem is bigger than simply sounding like an AI. Human speech is a time-tested neologism supply chain; people have a natural inventiveness when talking and writing. But as we increasingly communicate with chatbots and rely on AI agents to dissect concepts, summarize research reports, and synthesize internet searches, we’re filtering a wide array of content through the stilted and bounded syntax of LLMs. Its even changing how we communicate. Researchers have suggested some AI-based writing assistance models can whittle away the overall diversity of human writing, shrinking the size of our collective vocabulary. AI may literally be putting words into our mouths, as repeated exposure leads people to internalize and reuse buzzwords they might not have chosen naturally, Tom Juzek, a professor at Florida State University, told Fast Company earlier this year. With colleagues, he recently identified a vocabulary list of AI-speak, including words like intricate, strategically, and garner. He also found that these words are now more likely to show up in unscripted podcasts, a strong sign of whats called lexical seepage. Can we plug the leak? AI companies are aware that off-the-self AI isnt always appealing. And theyre increasingly promising customization and tailoring that can bend these bots to our will and preference. You can tell ChatGPT the traits you want it to have, how you want it to talk to you, and any rules you want it to follow, OpenAI explained earlier this year upon the release of a new feature allowing users to choose preferred traits and personality features for their bots. If youre a scientist using ChatGPT to do research, youll want it to engage with you like a lab assistant. If youre caring for an elderly family member and need tips or companionship ideas, you might want ChatGPT to adopt a supportive tone. AI what I am In a perhaps-futile attempt to protect myself from AI speak, I told my ChatGPT agent to be more expansive with its vocabulary. Think widely-read, I told it. Also, try to use new words all the time! I want you to be varying up your vocabulary constantly. I banned the chatbot from ever using the phrases outlined by Juzeks research. Thus far, ChatGPT seems to have improved. I think, at least. Its avoiding the banned words, and seems to be making a good-faith effort to communicate less formulaically. Its reaching for verbs that reflect better understanding of what its actually talking about. But AI diction is a wormhole. The problem, Juzek explains, is that the nature of AI writing is about more than just our words, and extends to sentence structure and functional words like that, may, can, and should. “Asking your assistant to avoid buzzwords will probably make your writing look less AI-like to humans and reduce the chance that someone fires up a detector, he tells me. What it means for the bigger question of whether AI is homogenizing or flattening language, there — I think the jury is still out. The great homogening Some believe that a different approach could make AI a less rote communicator. Nathan Lambert writes in the newsletter Interconnects that the current LLMs arent trained to be good writers. These AIs are trying to be something for everyone, not platforms with voice and positionality, and are inclined to be succinct and neutral. The next step would be solving the problem of how models arent trained with a narrow enough experience. Specific points of view nurture voice, he writes. The target should be a model that can output tokens in any area or request that is clear, compelling, and entertaining. Well need to wait for that technology, though. In the meantime, we cannot AI our way out of this AI conundrum. These companies are advertising tools to make AI extensions of ourselves, and outsource chunks of our individuality into a machine designed by finding correlations and inputting meaning from the webs surfeit. The fear is that as we increasingly communicate with AI, well flatten human culture and speech in the process. Of course, this homogenization isnt new. Literature, radio, and television, and their linguistic evolutions, all had transnational reach. Social media created global slang. But AI is different. While it is a new technology, its not a new platform for our thoughts — its a new way of synthesizing them. This makes sense: Large language models are built by consolidating a vast trove of information into reasoning models that communicate like a digital common man. Meanwhile, we’re just here trying to be ourselves.
Category:
E-Commerce
All news |
||||||||||||||||||
|
||||||||||||||||||