Ben See Profile picture
Sep 18, 2021 5 tweets 2 min read Read on X
icymi

1. the curve from sperm-decline meta-analysis predicts that by 2045 median sperm counts will reach zero (because of chemicals in plastics) with no evidence the trend is tapering off

2. by 2045 global warming of >2°C may subject humans to thermal infertility

We can act.🧵
1.

We can act on this:

'If you follow the curve from the 2017 sperm-decline meta-analysis, it predicts that by 2045 we will have a median sperm count of zero. It is speculative to extrapolate, but there is also ft no evidence that it is tapering off.'dumptheguardian.com/society/2021/m…
2.

'Even species thought to roam far away from these sources of pollution are suffering from chemical contamination. A female killer whale.. was found to be one of the most contaminated biological specimens ever reported. Scientists say she never calved.'theconversation.com/male-fertility…
3.

'research suggests males of some species can become infertile even at less extreme temperatures [2-2.25C?]

Whether our findings extrapolate to other species, including mammals such as humans, is not yet clear. It’s certainly possible, given evidence..'theconversation.com/fly-infertilit…
4. More on chemicals and 'Western' sperm counts:

racist, sexist, and Eurocentric ideas 'can get embedded in the categories that scientists use to analyze data'

research needs to be 'designed, executed, and communicated by people with varied perspectives'.slate.com/technology/202…

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More from @ClimateBen

Jul 23
BREAKING: mass media stay silent as climate scientists all agree economic growth means Earth's species face the threat of dire 1.75- 2°C of global warming by the 2030s 🧵
1. Conservative estimates imply threat of >1.7°C by the 2030s.

James Hansen warns of 2°C.

'This high rate of warming is caused by a combination of greenhouse gas emissions being close to an all-time high and a reduction in the cooling impacts of aerosols'carbonbrief.org/guest-post-tra…
2. Conservative projections show 2°C as early as 2037. Species like humans reach limits of adaptation at this point. (Tropical ecosystems wrecked at 1.5°C.)

Change this Extinction Economy now to protect species and everyone now while it's still too late.
carbonbrief.org/analysis-what-…
Read 6 tweets
Jul 18
BREAKING:  climate scientists fear the worst after discovering Earth's plants and soils stopped absorbing CO₂ last year 🧵
1. 'Collapse of the land carbon sink in 2023..

plants and soils absorbed almost no CO2 last year'

'we may see a rapid acceleration of CO2 and global warming.. unforeseen in future climate models projections'

'ugly consequences'



arxiv.org/abs/2407.12447
2. Organise political and economic system change now to protect species and everyone.

Thread:
Read 7 tweets
Jul 16
BREAKING: scientists confirm rapid deoxygenation of oceans, lakes, rivers, and streams is now a threat to the stability of life on Earth 🧵
1. 'ongoing deoxygenation presents a major threat to the livelihoods of large parts of society and for the stability of life on our planet'

Causes of oxygen loss:

global warming due to greenhouse gas emissions

input of nutrients as a result of land use

phys.org/news/2024-07-l…
2. 'Planetary boundaries represent thresholds in major Earth system processes that are sensitive to human activity and control global-scale habitability and stability

critical oxygen thresholds are being approached at rates comparable to other.. processes'
Read 4 tweets
Jul 2
An amazing news story totally ignored by state-corporate media: according to even the most conservative and optimistic consensus assumptions there had to be 'immediate action' years ago at the very latest with emissions peaking and falling by now to avoid utterly catastrophic 2C.
Image
For 1.5C, 2025 greehouse gas emissions would be 20-30% lower than 2020 levels, and between 10-20% lower for 2C.

Emissions are higher than ever in July 2024.

This Extinction Economy means 2.5/3°C by the 2040s or soon after.
Read 4 tweets
Jul 2
BREAKING: scientists warn we're beginning to feel the effects of a geologically instantaneous 21st century shift into extreme and unsurvivable conditions 🧵
1. 'We are starting to feel the effects of transitioning to a hothouse climate (ΔT  +4-5 °C) in a geological instant'

The global change happening now is potentially like the Permian extinction which occurred in just a few centuries.

phys.org/news/2018-09-e…
2. "In my view it is impossible to survive that sort of change (4°C by 2100). That is beyond human physiology. But that is the trajectory we are on now.. No matter what we do with all the whiz-bang technology.. physiologically we cant survive that."

News?
Read 5 tweets
Jun 28
BREAKING:  scientists now all agree humanity faces a global food supply catastrophe in roughly a decade or two 🧵
Biodiversity destruction/extinction disaster plus 2, 2.5 or even 3°C of warming by 2048.

This means severe sustained global impacts on food systems by 2035-2050 with conditions so extreme scientists can't prove they're survivable.


carbonbrief.org/analysis-what-…
phys.org/news/2023-09-h…
IPCC SRCCL report: Risks to land-related human systems and ecosystems Fig SPM 2
Even establishment climate scientists who organise consensus views (and often downplay catastrophe) show we can anticipate 2.1°C by (2035- ) 2050 at which point impacts become too severe to manage.



Climate is just one factor.
🧵:
ipcc.ch/srccl/chapter/…

IPCC SRCCL report: risks to land-related human systems and ecosystems
Read 10 tweets

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