After Mexican government cracked down on solar geoengineering, startup lets off balloons in Nevada
Luke Iseman, the founder of Make Sunsets, is about to launch a weather balloon filled with sulfur dioxide and helium into the air in Nevada.
Photo courtesy Make Sunsets
The solar geoengineering startup that had to cease operations in Mexico after the government cracked down on the idea of putting chemicals into the atmosphere to reflect sunlight away from the Earth has reemerged to launch balloons in Nevada.
On Tuesday, Make Sunsets announced it had completed three balloon launches near Reno, Nevada, each of which contained less than 10 grams of sulfur dioxide, which is the most commonly sited aerosol particle discussed in conversations about solar geoengineering. Two of the balloons launched also had location trackers, and one had a camera, too.
The idea of solar geoengineering has been around for decades and generally refers to spraying aerosol particles into the upper atmosphere in order to reflect the sun’s rays away from earth and back to space, cooling the earth and temporarily mitigating the effects of climate change.
Essentially, solar geoengineering is mimicking what happens when a volcano erupts, and it’s known to work. When Mount Pinatubo in the Philippines released thousands of tons of sulfur dioxide into the stratosphere in the 1991 eruption, the global temperature of the earth was lowered on average by about 1 degree Fahrenheit, according to the U.S. Geological Survey.
Solar geoengineering is not a solution to climate change, and nobody who studies it rigorously suggests it should be. It’s a temporary stopgap measure.
In addition, while releasing sulfur dioxide particles will cool the earth quickly and relatively inexpensively, it’s also dangerous. Injecting sulfur dioxide into the atmosphere could damage the ozone layer, cause respiratory illness and create acid rain.
But as the effects of climate change become more obvious, people are beginning to take the idea more seriously.
The White House is coordinating a five-year research plan into solar geoengineering, the quadrennial U.N.-backed Montreal Protocol assessment report included an entire chapter addressing stratospheric aerosol injection (more colloquially called solar geoengineering), and Dustin Moskovitz, a co-founder of Facebook, is funding solar geoengineering research via his philanthropic organization, Open Philanthropy.
While momentum is building, there isn’t any international governance rules about how to study and potentially regulate the idea.
Luke Iseman, a serial inventor and the former director of hardware at Y Combinator, launched Make Sunsets in October in an effort to push that envelope. San Mateo-headquartered venture capital firm BoostVC invested $500,000 in the startup and Iseman brought in a co-founder, Andrew Song.
The launches in Nevada earlier in February occurred at the Rancho San Rafael Regional Park in Reno, , where an annual hot-air balloon festival takes place, Iseman told CNBC.
They chose Nevada “because it’s in the U.S., we’re very confident we know and followed all applicable rules, know the terrain well from past adventures, and, we didn’t want to interfere with a friend’s efforts to get a marine cloud brightening project permitted in California,” Iseman told CNBC.
The Nevada launch was previously detailed by Time reporters, who were there. It was a shoe-string MacGyver-ed event orchestrated out of a hotel room, with a grill and weather balloon equipment. But, as evidenced by the images embedded below, shared with CNBC by Make Sunsets, the balloons lifted off.
Make Sunsets team is filling sulfur dioxide in a bag preparing for launch.
Photo courtesy Make Sunsets
Make Sunsets team is weighing the bag filled with sulfur dioxide gas in a bag preparing for launch.
Photo courtesy Make Sunsets
Make Sunsets is filling the balloon with helium here.
Photo courtesy Make Sunsets
Here, founder Luke Iseman is preparing to release the weather balloon filled with sulfur dioxide and helium into the atmosphere. Make Sunsets says this is the first deployment of SAI, or stratospheric aerosol injection, another and more specific name for solar geoengineering.
Photo courtesy Make Sunsets
Luke Iseman, the founder of Make Sunsets, is about to launch a weather balloon filled with sulfur dioxide and helium into the air in Nevada.
Photo courtesy Make Sunsets
Make Sunsets launching a weather balloon filled with sulfur dioxide and helium into the air in Nevada.
Photo courtesy Make Sunsets
A view from the Make Sunsets balloon launched in Nevada.
Photo courtesy Make Sunsets
A view from the Make Sunsets balloon launched in Nevada.
Photo courtesy Make Sunsets
Iseman has both idealistic and practical goals.
“Most importantly: We need to cool earth to save millions of lives, hundreds of thousands of species, and buy the time we need to decarbonize,” Iseman told CNBC.
To make the business sustainable, Make Sunsets is selling cooling credits, which gives companies and individuals a way to offset the effects of their carbon emissions. But the startup has yet to deliver.
“We have 2,790 cooling credits ordered by 58 paying customers that we haven’t yet delivered,” Iseman told CNBC. “On one hand, we’re working hard on a controversial project to cool earth. On the other, we’re a startup with the same basic challenge as any other: get customers to pay more for what we’re selling than it costs to make it.”
Make Sunsets said it made the FAA aware that it was releasing a balloon.
The FAA provided the following statement: “The FAA has comprehensive regulations for safely operating unmanned free balloons. Among other things, the regulations require the balloon to be equipped so it can be tracked by radar, and the operator to notify the FAA prior to and at the time of launch, monitor and record the balloon’s course, make position reports to the FAA as requested, and notify the FAA when the balloon begins its descent and its expected trajectory.”
Correction: A previous version of this story misstated what the balloons contained. All three of them had sulfur dioxide.
A driver for an independent contractor to FedEx delivers packages on Cyber Monday in New York, US, on Monday, Nov. 27, 2023.
Stephanie Keith | Bloomberg | Getty Images
President Donald Trump on Wednesday signed an executive order shutting the de minimis trade loophole, effective May 2.
Trump in February abruptly ended the de minimis trade exemption, which allows shipments worth less than $800 to enter the U.S. duty-free. The order overwhelmed U.S. Customs and Border Protection employees and caused the U.S. Postal Service to temporarily halt packages from China and Hong Kong. Within days of its announcement, Trump reversed course and delayed the cancellation of the provision.
Wednesday’s announcement, which came alongside a set of sweeping new tariffs, gives customs officials, retailers and logistics companies more time to prepare. Goods that qualify under the de minimis exemption will be subject to a duty of either 30% of their value, or $25 per item. That rate will increase to $50 per item on June 1, the White House said.
Use of the de minimis provision has exploded in recent years as shoppers flock to Chinese e-commerce companies Temu and Shein, which offer ultra-low cost apparel, electronics and other items. The U.S. Customs and Border Protection has said it processed more than 1.3 billion de minimis shipments in 2024, up from over 1 billion shipments in 2023.
Critics of the provision say it provides an unfair advantage to Chinese e-commerce companies and creates an influx of packages that are “subject to minimal documentation and inspection,” raising concerns around counterfeit and unsafe goods.
The Trump administration has sought to close the loophole over concerns that it facilitates shipments of fentanyl and other illicit substances on the claims that the packages are less likely to be inspected by customs agents.
Temu and Shein have taken steps to grow their operations in the U.S. as the de minimis loophole has come under greater scrutiny. After onboarding sellers with inventory in U.S. warehouses, Temu recently began steering shoppers to those items on its website, allowing it to speed up deliveries. Shein opened distribution centers in states including Illinois and California in 2022, and a supply chain hub in Seattle last year.
WATCH: President Trump signs executive orders for reciprocal tariffs
Apple CEO Tim Cook, center, watches during the inauguration ceremonies for President Donald Trump, right, and Vice President JD Vance, left, in the rotunda of the U.S. Capitol in Washington, Jan. 20, 2025.
Shawn Thew | Afp | Getty Images
Apple slid more than 6% in late trading Wednesday and led a broader decline in tech stocks after President Donald Trump announced new tariffs of between 10% and 49% on imported goods.
The majority of Apple’s revenue comes from devices manufactured primarily in China and a handful of other Asian countries. Nvidia, which manufactures new chips in Taiwan and assembles its artificial intelligence systems in Mexico and elsewhere, fell about 4%, while electric vehicle company Tesla dropped 4.5%.
Across the rest of the megacap universe, Alphabet, Amazon and Meta all dropped between 2.5% and 5%, and Microsoft was down by almost 2%.
If Apple’s postmarket loss is matched in regular trading Thursday, it would be the steepest decline for the stock since September 2020.
Trump on Wednesday afternoon said the new taxes on imported goods would be a “declaration of economic independence” for the country. He announced a 10% blanket tariff on all imports, and higher duties for specific countries, including 34% for China, 20% for European nations, and 24% for Japanese imports, based on what tariffs they charge on U.S. exports, Trump said.
“We will supercharge our domestic industrial base, we will pry open foreign markets and break down foreign trade barriers,” Trump said during his speech. “Ultimately, more production at home will mean stronger competition and lower prices for consumers.”
Stocks broadly got hit by Trump’s announcements. An exchange-traded fund tracking the S&P 500 slid 2.8%, while an ETF following the Nasdaq 100 lost more than 3%.
During his speech, Trump praised Apple, Meta, and Nvidia for spending money and investing in the United States.
“Apple is going to spend $500 billion, they never spent money like that here,” Trump said. “They’re going to build their plants here.”
The Nasdaq just wrapped up its worst quarter since 2022, dropping 10% in the first three months of the year, though the tech-heavy index rose in each of the first two days of the second quarter.
WATCH: President Trump signs executive orders for reciprocal tariffs
Guests including Mark Zuckerberg, Lauren Sanchez, Jeff Bezos, Sundar Pichai and Elon Musk attend the Inauguration of Donald J. Trump in the U.S. Capitol Rotunda on January 20, 2025 in Washington, DC. Donald Trump takes office for his second term as the 47th president of the United States.
Julia Demaree Nikhinson | Getty Images
Amazon submitted a bid to the White House to purchase the social media app TikTok from its Chinese owners, CNBC has confirmed.
The company sent its proposal in a letter this week to Vice President JD Vance and Commerce Secretary Howard Lutnick, according to a source familiar with the matter who asked not to be named because the discussions are confidential. The parties aren’t treating the bid seriously, however, given that it was submitted just days before a deadline staving off a U.S. ban is set to expire, the person said.
Amazon declined to comment.
The e-commerce company’s offer, which was first reported by The New York Times, comes as TikTok’s fate in the U.S. is up in the air. The short-form video app faces another potential shutdown in the U.S. on April 5 if ByteDance, its parent company, can’t reach a deal to divest TikTok’s American operations. Lawmakers passed a bill last year setting a Jan. 19 deadline for the sale, but Trump signed an executive order granting a 75-day extension for a potential deal.
Trump could announce a decision on TikTok’s fate in the U.S. as soon as Wednesday, sources familiar with the situation told CNBC’s David Faber. Mobile technology company AppLovin has also made a bid for TikTok, Faber reported separately, citing sources familiar with the matter.
TikTok has emerged as a major hub for e-commerce as it has poured money into growing its online marketplace, called TikTok Shop. TikTok’s lucrative marketplace, coupled with the app’s more than 170 million users, could be an attractive asset for Amazon. Following TikTok’s success, Amazon launched and then shuttered a short-form video service of its own.
Last August, the two companies formed a partnership that allowed TikTok users to link their account with Amazon and make purchases from the site without leaving the app. The deal attracted scrutiny from lawmakers who were concerned about its potential national security risks.
WATCH: How TikTok Shop is beating Amazon and Temu in social shopping
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