Month: August 2024

Enlarge / A view of the Pantanal wetlands in Brazil. New research shows a large chunk of global methane emissions are from rotting vegetation in tropical wetlands. (credit: Carl de Souza/AFP via Getty Images)

A 2021 pledge by more than 100 nations to cut methane emissions from anthropogenic sources 30 percent by 2030 might not slow global warming as much as projected, as new research shows that feedbacks in the climate system are boosting methane emissions from natural sources, especially tropical wetlands.

A new trouble spot is in the Arctic, where scientists recently found unexpectedly large methane emissions in winter. And globally, the increase in water vapor caused by global warming is slowing the rate at which methane breaks down in the atmosphere. If those feedbacks intensify, scientists said, it could outpace efforts to cut methane from fossil fuel and other human sources.

Methane traps about 80 times more heat than carbon dioxide over a 20-year period, and scientists estimate it’s responsible for 20 to 30 percent of climate warming since the start of the industrial age, when atmospheric methane was at a concentration of about 0.7 parts per million. It has zig-zagged upward since then, spiking with the first fossil gas boom in the 1980s, then leveling off slightly before a huge surge started in the early 2000s. The amount of methane in the atmosphere reached about 1.9 ppm in 2023, nearly three times the pre-industrial level.

Enlarge / Astrobotic's Peregrine lander, with some of its propellants visible, before shipment from the company's headquarters in Pittsburgh to the launch site in Florida. (credit: Astrobotic)

Seven months after its first lunar lander fell short of reaching the Moon, Astrobotic announced Tuesday that the spacecraft was stricken by a valve failure that caused a propellant tank to burst in orbit. The company's next landing attempt, using a much larger spacecraft, will include fixes to prevent a similar failure.

Astrobotic's first Peregrine lander, which the company called Peregrine Mission One, launched January 8 aboard United Launch Alliance's first Vulcan rocket. But soon after separating from the rocket in space, the lander ran into trouble as it stepped through an activation sequence to begin priming its propulsion system.

A review board determined "the most likely cause of the malfunction was a failure of a single helium Pressure Control Calve called a PCV—Pressure Control Valve 2, within the propulsion system," said John Horack, a space industry veteran and professor of aerospace and mechanical engineering at Ohio State University.

Enlarge / A screen capture of landing video of a Falcon 9 rocket just before it tips over on Wednesday morning. (credit: SpaceX)

Early on Wednesday morning, at 3:48 am ET local time, a Falcon 9 rocket booster making its 23rd launch took off from Space Launch Complex-40 at Cape Canaveral, Florida.

The mission successfully delivered 21 Starlink satellites, including 13 of the larger vehicles with direct-to-cell capabilities, before attempting a landing on the A Shortfall of Gravitas. However, the experienced booster had a shortfall of stability and tipped over shortly following touchdown.

Prior to Wednesday's landing failure, SpaceX had landed 267 boosters in a row. The company's last failure occurred in February 2021. The cause of the failure was not immediately clear, and SpaceX said "teams are assessing the booster's flight data and status." Based on video of the landing, it is possible there was an engine burn timing issue.