Tag

Co2

All articles tagged with #co2

science19 days ago•10 min saved

Earth’s Quiet End: A Brighter Sun Could Turn Our Planet Venus-like in About a Billion Years

As the Sun brightens over roughly the next billion years, Earth’s climate will gradually lose atmospheric CO2, undermining C3 plants and triggering a moist greenhouse that erodes oceans by allowing hydrogen to escape to space. This slow process could render Earth uninhabitable long before the Sun becomes a red giant, gradually stripping away breathable air and water and pushing the planet toward a Venus-like state. The one‑billion-year timeline is uncertain and climate feedbacks like the carbonate-silicate thermostat can delay outcomes, but the overall arc points to a hostile, sterilized Earth long before the Sun’s ultimate evolution.

via 19FortyFive|

#co2 #earth #moist-greenhouse

science29 days ago•14 min saved

Breath of Tourists Threatens the World’s Show Caves

Public show caves are fragile microclimates: the CO2-rich, warm, moist air released by visitors changes the cave atmosphere enough to dissolve calcium carbonate on stalactites, effectively eroding formations that took hundreds of thousands of years to grow. The pattern is illustrated by Altamira’s historic CO2 spikes and closures, Lascaux’s closure in the 1960s, and ongoing issues in Romanian show caves where the environment never fully recovers between visits and lampenflora worsens decay. Conservation responses include limiting visitor numbers, upgrading to LED lighting, installing airlocks, and in some cases building above-ground replicas; in short, the very act of public viewing is jeopardizing the future of these ancient structures.)

via Space Daily|

#caves #co2 #conservation

science1 month ago•5 min saved

Drylands Could Hit 40% of Earth's Land by 2100, Study Finds

A CMIP6-based analysis using a CO2-modified PET framework projects global drylands expanding from about 38.6% of Earth's land today to roughly 39.3–40.3% by 2071–2100, with CO2-driven plant-water-use effects potentially slowing the rise; Australia is expected to see the strongest changes, though outcomes depend on emissions scenarios.

via ScienceAlert|

#aridity #climate-change #co2

science-and-environment1 month ago•13 min saved

Antarctic Ice Cores Extend Earth's Ancient Atmosphere Back to 1.2 Million Years

Bubbles trapped in Antarctic ice at Dome C preserve a continuous record of Earth's atmosphere for about 800,000 years, with the EPICA project drilling a 3,270‑metre core to chart past CO2 and gas compositions; a 2025 follow-up near Little Dome C extends the archive to around 1.2 million years, though the deepest sections show extreme compression that reduces resolution, revealing that CO2 ranged from ~180 ppm in ice ages to ~280 ppm in warmer periods, while today’s levels exceed the natural variation seen in the record.

via spacedaily.com|

#antarctica #climate-change #co2

science1 month ago•15 min saved

Slow mantle uplift seeded East Antarctica's continental ice sheet 34 million years ago

A 2026 modelling study links East Antarctica’s rise to Jurassic-era mantle processes triggered by continental breakup, arguing that tens of millions of years of uplift created a high interior and ice-hardy topography that allowed a continent-wide ice sheet to form around 34 million years ago even while global temperatures were about 5°C warmer than today. Falling CO2 remained the primary trigger, with topography and albedo feedbacks helping seed and stabilize the ice, though this reconstruction carries uncertainties and does not guarantee modern ice safety.

via Space Daily|

#antarctica #co2 #eocene-oligocene-transition

science1 month ago•6 min saved

Ancient CO2 spike felled forests—what PETM teaches today’s trees

Researchers studying the Paleocene–Eocene Thermal Maximum (~56 million years ago) show a rapid CO2 rise caused 5–9°C warming and a forest collapse: initial canopy gains were followed by a 61% drop in leaf-area index, fern-dominated landscapes, and long-lasting reduction in carbon storage, illustrating how heat can override CO2 fertilization—an alarming parallel for today’s warming forests.

via Nature|

#climate-change #co2 #forests

science2 months ago•19 min saved

Oak Forests Could Store More Carbon as CO2 Rises, Through a Soil-Microbe Nitrogen Link

Six-year CO2 enrichment around 180-year-old English oaks shows trees grew more wood by tapping additional soil nitrogen through a root-microbe partnership: elevated CO2 raised usable soil nitrogen by about 29%, trees absorbed extra nitrogen, and soil released almost what the trees used, indicating a faster but tighter nitrogen cycle and lower nitrous oxide emissions; while this hints at greater carbon storage in forests, nitrogen reserves are finite and the overall soil carbon balance remains uncertain, with results published in Science Advances.

via Earth.com|

#carbon-storage #co2 #forests

science2 months ago•6 min saved

Atmospheric CO2 climbs, with early signs detected in human blood chemistry

An open‑access study using U.S. health data (1999–2020) finds that rising atmospheric CO2—from about 300 ppm to over 420 ppm and rising ~2 ppm/year—coincides with about a 7% rise in blood bicarbonate, and declines in calcium and phosphorus, the minerals involved in buffering CO2. While the link is correlational and measurement methods varied, authors warn that humans evolved under stable CO2 levels and may be stressed by current changes, potentially pushing buffering chemistry toward unhealthy ranges by around 2076–2100.

via Boing Boing|

#air-quality #blood-bicarbonate #climate-change

health2 months ago•8 min saved

What Makes You a Mosquito Target: Blood Type, CO2, and More

Mosquito bites aren’t random: people with blood type O, higher CO2 and lactic-acid output, warmer skin, darker clothing, or higher metabolism (from exercise, pregnancy, or alcohol) attract more bites. To prevent bites, avoid peak times (sunrise and sunset), cover exposed skin, and use effective repellents such as 5% DEET; keep a fan on to disrupt airflow indoors, and citronella lacks solid evidence. If bitten, apply cold packs, hydrocortisone, or non-drowsy antihistamines to ease itch.

via HuffPost|

#blood-type #co2 #health

science2 months ago•48 min saved

Plants Could Survive About 1.8 Billion More Years as the Sun Brightens

A new study using 29 climate models projects Earth’s plant life could persist for roughly 1.3–1.9 billion years as the Sun brightens and atmospheric CO2 declines, with CAM photosynthesis plants (like cacti and orchids) potentially lasting the longest. Under weak weathering CAM plants survive to about 1.87 billion years, under strong weathering about 1.35 billion years, and using CAM as a survivability threshold raises that to roughly 1.84–1.87 billion years. The end of Earth’s biosphere would coincide with the oceans being lost to space as the Sun brightens, while the Sun’s eventual Red Giant phase is ~5 billion years away. The authors note limitations (they only assessed current photosynthesis pathways) and call for broader 3-D modeling to better constrain these timescales.

via Yahoo|

#biosphere #climate-models #co2

science3 months ago•52 min saved

Earth’s Green Horizon: Plants Could Endure for 1.87 Billion Years, Study Says

A study in the Journal of Geophysical Research: Atmospheres uses 3D climate models to project Earth's vegetative biosphere over the next 2 billion years. It finds the last plant could linger about 1.84–1.87 billion years from now as the Sun brightens; under a strong CO2-weathering cycle, CO2 drops and plants die around 1.84 billion years, while in a weak-weathering scenario temperatures rise to about 65°C, pushing land plants to extinction about 1.87 billion years out. The researchers caution that evolution or human tech could extend plant survival beyond these limits, and the simulations do not account for future plant adaptation or geoengineering possibilities.} } }**Note: There is an extraneous closing tokens at the end due to formatting; correct JSON would end after the closing brace.** However, in this response, the essential fields are provided.** (If you’d like, I can present the strictly formatted JSON payload.)**}

via Yahoo|

#climate #co2 #earth

science3 months ago•6 min saved

Earth’s Last Green Era Could End in About 1.9 Billion Years

A 3D climate-model study projects that Earth's vegetative biosphere could persist for about 1.84–1.87 billion years as the Sun brightens. Depending on how the carbonate-silicate weathering cycle responds to warming, CO2 may steadily drop and starve plants (strong weathering) or temperatures could climb to around 65°C (weak weathering), placing the maximum plant lifetime at roughly 1.87 billion years. The researchers note that evolution, future technology, or geoengineering could extend this, potentially making the biosphere’s lifetime similar to the duration of Earth’s oceans.

via ScienceAlert|

#biosphere #climate #co2

world3 months ago•40 min saved

Thawing Permafrost: Rocks Like Carbon Sinks May Offset Emissions, Study Finds

A Nature study across 50 rivers on China's Qinghai–Tibet Plateau shows that thawing permafrost accelerates rock weathering, which consumes atmospheric CO2 and can offset or even exceed river CO2 emissions in some catchments, suggesting geological processes may partly counterbalance thaw-induced carbon release.

via Good News Network|

#carbon-cycle #climate #co2

science4 months ago•4 min saved

CO2's paradox: surface warming, stratospheric cooling explained

A Nature Geoscience study shows rising CO2 makes the stratosphere more efficient at radiating infrared heat into space, causing cooling of the upper atmosphere (about 2°C since the mid-1980s), with faster cooling higher up near the stratopause. Researchers describe a 'Goldilocks zone' of infrared wavelengths that drive this cooling, while ozone and water vapor play smaller roles. If CO2 doubles, stratospheric temperatures near the stratopause may drop roughly 8°C, highlighting a key, quantifiable climate fingerprint and its implications for Earth's energy balance and exoplanet atmospheres.

via The Daily Galaxy|

#climate-change #co2 #cooling

science5 months ago•4 min saved

Antarctic Ice Core Extends Earth's Climate Record to 1.2 Million Years

Europe-wide researchers drilled a 2.8-km Antarctic ice core to produce the longest continuous climate record, about 1.2 million years, showing atmospheric CO2 closely tracking global temperatures across repeated cycles and offering new clues to why ice ages intensified during the Mid-Pleistocene transition. The Beyond EPICA findings—presented at the European Geosciences Union meeting—are early results, not yet peer‑reviewed, with more data to come from the ancient air bubbles trapped in the ice.

via Nature|

#antarctica #climate-science #co2