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♫ It’s getting hot in here, so close up all your domes ♫
Home runs ain’t the half of it.
Last week, the Bulletin of the American Meteorological Society issued a widely cited report that found global warming is “juicing” baseballs. The result is an extra 50 or so home runs per year in the major leagues. “It’s basic physics,” The Associated Press explained. “When air heats up, molecules move faster and away from each other, making the air less dense. Baseballs launched off a bat go farther through thinner air because there’s less resistance to slow the ball.”
Baseball fans have long been aware that hot weather makes for more home runs, so it follows that increasing temperatures will have an impact on the game in the years ahead. But MLB has more to worry about than the game becoming boring again because of too many dingers. Here are a few more ways climate change could irrevocably alter the future of America’s favorite past time:
We’ve already covered how the ball will behave differently off the bat. But what about out of the hand?
Heat and high humidity mean less air density, which in turn causes “fastballs to be faster, curveballs to curve less, and spin rates of pitches to be higher,” wrote Lawrence Rocks for SABR’s “Future of Baseball” issue in 2021. Of course, “these factors will cause pitchers to change their usage percentages on their pitch selection.”
As lowland parks grow hotter, we can expect them to behave more like the famously thin-aired Coors Field in Denver — particularly Atlanta, Kansas City, and Houston, which have among the lowest air densities of the Major League stadiums. Heat and humidity will cause baseballs to move more quickly out of the hand while the reduction in the Magnus force will cause them to break more poorly. And if fastballs get faster and curveballs break less, you can naturally expect to see more heaters in the game — and potentially more strikeouts as a result.
At the time of first pitch in Seattle, the Air Quality Index was 220. During the nine innings that followed, it would peak at 240 — more than twice the satisfactory level and “unhealthy for all groups.”
The year was 2020, and wildfires up and down the West Coast were making the empty stadiums even more apocalyptic. Shortly after smoke turned the Bay Area a dystopian orange, MLB decided to move home games from Seattle to San Francisco’s Oracle Park — because the air quality in the Pacific Northwest at that point was too unsafe for athletes.
\u201cA look outside the San Francisco Giants' stadium today.\u201d— SportsCenter (@SportsCenter) 1599694410
It won’t be the last time baseball games are moved or even postponed due to air quality from fires. In 2022, perhaps against better judgment, the Mariners played the ALDS against the Astros when the AQI was 158. Though the unwritten rule is to postpone games when the AQI tops 200, players are beginning to push back, saying — rightfully — that prolonged exposure to inhaling smoke is dangerous. “It’s not like if you’re below 200, everything is fine, and if you’re above 200, everybody is severely affected,” a public health official pointed out to The Athletic. “There’s a whole continuum.”
If the Oakland Athletics move to Las Vegas, they’re all but certain to become the ninth Major League baseball team with at least the ability — if not the necessity — to play indoors.
In addition to the fully enclosed Tropicana Dome in Tampa Bay, seven stadiums currently have retractable roofs. And it is in the warmest, sunniest markets where those roofs most often remain closed: “Miami … played under an open roof just five times in the past two seasons — combined,” Fox Weather reports. The Rangers, meanwhile, replaced their only-26-year-old ballpark in 2019 because it had gotten literally too hot to play in Texas without air conditioning.
It’s not uncommon for the remaining open-air ballparks to top 95 degrees in the summer — a miserable experience for players and fans alike. Without covering more ballparks, injuries could climb and attendance could drop. “People might just say forget about it. I’m not going to a baseball game. It’s 105 degrees,” Brad Humphreys, professor of economics at West Virginia University, told Capital News Service.
Triple-A baseball introduced electronic strike zones this season, fueling speculation that the controversial robo-ump system could be coming to the Major Leagues next. But there is one big reason in favor of electronic strike zones that doesn’t often get mentioned in the debate: climate change.
A recent study found that “umpires call pitches less accurately in uncomfortable temperatures, with performance at its worst in extreme heat conditions,” Monmouth University writes. Incorrect calls were made at a rate of about 1% worse when temperatures topped 95 degrees. And while that might seem insignificant, “it is non-trivial for this high-revenue, high-stakes industry,” the study’s author, Monmouth associate professor of economics Eric Fesselmeyer, said. “Moreover, high temperatures cause an even greater decrease in accuracy on close-call pitches along the edges of the strike zone.”
Aggression and violence rise with the temperatures. In one study, violent crimes went up by as much as 5.7% on days with a maximum daily temperature above 85 degrees, and as much as 10% on days above about 88.
As dugouts and diamonds get hotter, tempers will too. But there is another reason to believe there will be more bench-clearing brawls beyond heat-induced short-fuses. According to a study published in the Personality and Social Psychology Bulletin in 1991, “a positive and significant relationship was found between temperature and the number of hit batters per game, even when potentially confounding variables having nothing to do with aggression were partialed out.”
Similarly, Duke University’s Fuqua School of Business found in 2011 that “pitchers whose teammates get hit by a pitch are more likely to retaliate and plunk an opposing batter when the temperature reaches 90 degrees than when it is cooler.” Curiously, if no one has been hit in a game, the study found “high temperatures have little effect on a pitcher’s behavior.” As one of the researchers put it, “heat affects a specific form of aggression. It increases retribution.”
Hurricane Ian — the category 4 hurricane that slammed southwest Florida last September — was the state’s costliest storm, inflicting $109 billion in damage including “totally” destroying 900 structures in Fort Meyers Beach alone. Among the damages: CenturyLink Sports Complex, the spring training facility of the Minnesota Twins; Fenway South, the Boston Red Sox’s facility; and Charlotte Sports Park, the Tampa Bay Rays’ spring training home, which sustained damage so extensive that the team had to find another stadium to practice in during the 2023 spring training season.
The lasting damage of the storm extends beyond the physical: “Hurricane Ian’s impact on Lee County likely played a role in depressing the crowds at Red Sox and Twins games this year,” Fort Myers News-Press reports.
There are no murmurs of moving the Grapefruit League’s spring training facilities — yet. But already the rising sea levels and storms of Florida are ruling out new stadium locations, including at least one potential regular-season home for the Rays. “Sites that once appeared to be great places to build a ballpark are now expected to be underwater,” the team president said. With climate already costing teams money and fans, as well as being a deciding factor in new builds, the Grapefruit League could prudently decide to uproot for higher grounds.
Homebuyers are taking into account the future climate conditions of potential properties, and if MLB is wise, it will do the same when considering team expansion.
From a climate standpoint, it already seems egregious to move a team to a desert city that is running out of drinkable water in the summer, though the Oakland A’s potential relocation to Las Vegas is still very much on the table. But when MLB looks at locations to expand to — Portland, Mexico City, North Carolina, Nashville, Montreal, and Vancouver have also been floated — the climate calculus becomes ever more important.
In 60 years, Portland will have a climate similar to Sacramento, complete with the threat of wildfire smoke. Mexico City is getting hotter, drier, and sinking. Charlotte and Raleigh will eventually “resemble the Florida panhandle, specifically Tallahassee, which is 12.6 °F warmer and 10.6% to 14.4% wetter than winter in Charlotte and Raleigh. Nashville is not too far, with Mobile, Alabama serving as its closest projection,” Fangraphs writes in an assessment of the future of ballparks in the climate crisis.
Unsurprisingly, with an eye for the future, it is the northernmost cities that look like the best options to withstand climate change impacts: “Vancouver and Montreal could look toward current day T-Mobile Park and Citizens Bank Park as examples of how to keep fans comfortable during games.”
Over the course of 12 months between 2019 and 2020, 10% of MLB teams switched from real grass to turf. “The three stadiums that replaced their grass share a lot in common,” wrote The Wall Street Journal at the time: “They play in cities with extreme weather and have retractable roofs.”
In Arizona, for example, real grass required sunlight — and thus an open roof — until between 4 p.m. and 7 p.m., which meant that players often worked out before games in temperatures of 110 degrees or more. By the time fans arrived, the building would still be sweltering, air conditioning not having yet kicked in. But by switching to turf, “the roof can remain closed all summer.”
Switching to turf also eliminates the demands of watering: Conservatively, about 62,500 gallons of water a week are required to maintain an average field, an amount 89 homes would use in the same amount of time. Though that water is likely negligible in the grand scheme of things, it’s important for teams to take “social responsibility” by “walking the walk,” Diamondbacks president and CEO Derrick Hall told The Associated Press.
Turf remains controversial — it can affect the bounce of balls and result in higher rates of injuries. Recent advances in turf technology, though, are making it more appealing for teams and the planet.
Anyone who’s ever watched nine innings of live baseball knows the kind of mess fans leave behind: peanut shell piles; beer cups; burger trays; plastic ice cream bowls shaped like hats; abandoned bobbleheads. Overall, baseball audiences create more than 1,000 tons of waste every season, according to the Green Sports Alliance.
A growing number of stadiums are now aspiring to contribute less to landfills, including by using compostable serving items and reducing food waste. But one place waste is still frequently overlooked is in promotional giveaways.
Every year, MLB gives away around four million bobbleheads in addition to other tchotchkes like branded visors, T-shirts, sunglasses, and bags. While some of these end up as treasured pieces of home collections, the vast majority are junk destined for landfills.
Though teams show no sign of forgoing giveaways anytime soon, the more environmentally conscious parks may begin to consider new ways of reducing their waste — including by curbing handouts of cheaply made petroleum products and environmentally taxing garments that no one actually needs.
Every year, athletes end up on the Injured List for reasons ranging from benign to ridiculous. Now there is a new reason to be pulled from a game: heat illness. During one 2018 game at Wrigley Field with a heat index of 107, four players ultimately left the field for temperature-related causes, including three who had to be treated with IV fluids. During another game in 2021, a 28-year-old pitcher vomited on the mound in New York City. Diagnosis? Heat exhaustion.
Normal sports injuries also spike as it gets warmer. “We always had what seemed to be a lot more soft-tissue leg injuries than some of the other clubs. Hamstrings, calf injuries, from guys running the bases,” a former Rangers trainer told The Atlantic in 2016, prior to the construction of the team’s new air-conditioned stadium. “Our staff attributed that to the excessive heat and the fatigue.”
The prevalence of naturally occurring injuries could go up too because as players get dehydrated, their brain, thought capacity, and reflexes “are affected and the player is not able to react immediately on the field,” a 2021 study by the International Journal of Physical Education found. “The player will be injured due to a fall or collision with another player or being hit by a ball.”
Tragically, rising temperatures also are known to contribute to an increased number of deaths, a pattern already observable in high school football. Baseball fans and minor league athletes have already died due to heat-related causes — an awful pattern that isn’t likely to abate.
In 2017, the mercury during the first game of the World Series in Los Angeles hit 103 degrees after 5 p.m.; the same year, the Oakland A’s Triple-A affiliate played in 111-degree heat in Las Vegas. On average, the temperature across the 27 Major League Baseball cities has risen over two degrees since 1970. And “the difference in home run rates between a 90-degree day and a 40-degree day is roughly equivalent to the difference between hitting in Citizens Bank Park” — which is small — “versus Citi Field,” which is comparatively huge, ESPN reports.
In our hotter, damper future, baseball will be a markedly different game than it was 50 years ago — or even now. Heat will affect players’ reflexes and focus. Balls will move differently through thinner, warmer air. Fielding could change ever so slightly as turf becomes more common, and pitchers might switch up their pitches as electronic strike zones come into use and curveballs become less effective.
All good statistical comparisons need context, and that is especially true in the ever-changing sport of baseball. But in the next century of the sport, it is all but certain that the literal environment of the games — from the weather to the air density to the AQI — will be a necessary asterisk beside unusual home runs and IL designations. One day, announcers may even reminisce about “open air” stadiums from their climate-controlled booths during downtime on broadcasts. Perhaps we’ll even have a name for the days of comparatively thicker air: the “cool-ball era.”
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And more on the week’s most important conflicts around renewable energy projects.
1. Lawrence County, Alabama – We now have a rare case of a large solar farm getting federal approval.
2. Virginia Beach, Virginia – It’s time to follow up on the Coastal Virginia offshore wind project.
3. Fairfield County, Ohio – The red shirts are beating the greens out in Ohio, and it isn’t looking pretty.
4. Allen County, Indiana – Sometimes a setback can really set someone back.
5. Adams County, Illinois – Hope you like boomerangs because this county has approved a solar project it previously denied.
6. Solano County, California – Yet another battery storage fight is breaking out in California. This time, it’s north of San Francisco.
A conversation with Elizabeth McCarthy of the Breakthrough Institute.
This week’s conversation is with Elizabeth McCarthy of the Breakthrough Institute. Elizabeth was one of several researchers involved in a comprehensive review of a decade of energy project litigation – between 2013 and 2022 – under the National Environment Policy Act. Notably, the review – which Breakthrough released a few weeks ago – found that a lot of energy projects get tied up in NEPA litigation. While she and her colleagues ultimately found fossil fuels are more vulnerable to this problem than renewables, the entire sector has a common enemy: difficulty of developing on federal lands because of NEPA. So I called her up this week to chat about what this research found.
The following conversation was lightly edited for clarity.
So why are you so fixated on NEPA?
Personally and institutionally, [Breakthrough is] curious about all regulatory policy – land use, environmental regulatory policy – and we see NEPA as the thing that connects them all. If we understand how that’s functioning at a high level, we can start to pull at the strings of other players. So, we wanted to understand the barrier that touches the most projects.
What aspects of zero-carbon energy generation are most affected by NEPA?
Anything with a federal nexus that doesn’t include tax credits. Solar and wind that is on federal land is subject to a NEPA review, and anything that is linear infrastructure – transmission often has to go through multiple NEPA reviews. We don’t see a ton of transmission being litigated over on our end, but we think that is a sign NEPA is such a known obstacle that no one even wants to touch a transmission line that’ll go through 14 years of review, so there’s this unknown graveyard of transmission that wasn’t even planned.
In your report, you noted there was a relatively small number of zero-carbon energy projects in your database of NEPA cases. Is solar and wind just being developed more frequently on private land, so there’s less of these sorts of conflicts?
Precisely. The states that are the most powered by wind or create the most wind energy are Texas and Iowa, and those are bypassing the national federal environmental review process [with private land], in addition to not having their own state requirements, so it’s easier to build projects.
What would you tell a solar or wind developer about your research?
This is confirming a lot of things they may have already instinctually known or believed to be true, which is that NEPA and filling out an environmental impact statement takes a really long time and is likely to be litigated over. If you’re a developer who can’t avoid putting your energy project on federal land, you may just want to avoid moving forward with it – the cost may outweigh whatever revenue you could get from that project because you can’t know how much money you’ll have to pour into it.
Huh. Sounds like everything is working well. I do think your work identifies a clear risk in developing on federal lands, which is baked into the marketplace now given the pause on permits for renewables on federal lands.
Yeah. And if you think about where the best places would be to put these technologies? It is on federal lands. The West is way more federal land than anywhere else in the county. Nevada is a great place to put solar — there’s a lot of sun. But we’re not going to put anything there if we can’t put anything there.
What’s the remedy?
We propose a set of policy suggestions. We think the judicial review process could be sped along or not be as burdensome. Our research most obviously points to shortening the statute of limitations under the Administrative Procedures Act from six years to six months, because a great deal of the projects we reviewed made it in that time, so you’d see more cases in good faith as opposed to someone waiting six years waiting to challenge it.
We also think engaging stakeholders much earlier in the process would help.
The Bureau of Land Management says it will be heavily scrutinizing transmission lines if they are expressly necessary to bring solar or wind energy to the power grid.
Since the beginning of July, I’ve been reporting out how the Trump administration has all but halted progress for solar and wind projects on federal lands through a series of orders issued by the Interior Department. But last week, I explained it was unclear whether transmission lines that connect to renewable energy projects would be subject to the permitting freeze. I also identified a major transmission line in Nevada – the north branch of NV Energy’s Greenlink project – as a crucial test case for the future of transmission siting in federal rights-of-way under Trump. Greenlink would cross a litany of federal solar leases and has been promoted as “essential to helping Nevada achieve its de-carbonization goals and increased renewable portfolio standard.”
Well, BLM has now told me Greenlink North will still proceed despite a delay made public shortly after permitting was frozen for renewables, and that the agency still expects to publish the record of decision for the line in September.
This is possible because, as BLM told me, transmission projects that bring solar and wind power to the grid will be subject to heightened scrutiny. In an exclusive statement, BLM press secretary Brian Hires told me via e-mail that a secretarial order choking out solar and wind permitting on federal lands will require “enhanced environmental review for transmission lines only when they are a part of, and necessary for, a wind or solar energy project.”
However, if a transmission project is not expressly tied to wind or solar or is not required for those projects to be constructed… apparently, then it can still get a federal green light. For instance in the case of Greenlink, the project itself is not explicitly tied to any single project, but is kind of like a transmission highway alongside many potential future solar projects. So a power line can get approved if it could one day connect to wind or solar, but the line’s purpose cannot solely be for a wind or solar project.
This is different than, say, lines tied explicitly to connecting a wind or solar project to an existing transmission network. Known as gen-tie lines, these will definitely face hardships with this federal government. This explains why, for example, BLM has yet to approve a gen-tie line for a wind project in Wyoming that would connect the Lucky Star wind project to the grid.
At the same time, it appears projects may be given a wider berth if a line has other reasons for existing, like improving resilience on the existing grid, or can be flexibly used by not just renewables but also fossil energy.
So, the lesson to me is that if you’re trying to build transmission infrastructure across federal property under this administration, you might want to be a little more … vague.