1. many scientists say CO2 concentration levels must be stabilized at 450 ppm to avoid the worst impacts of climate change
2. we're now at 417 ppm
3. governments & corporations plan on keeping emissions so high this decade that we can expect to add 33 ppm by 2033
'Many scientists argue that the CO2 concentration must be stabilized at 450 ppm to avoid the worst impacts of climate change. Some activists argue for a more ambitious goal of 350 ppm'
The phrase 'worst impacts' sounds suspiciously euphemistic.
'Atmospheric carbon dioxide concentration will soar past a scary threshold this year, exceeding 417 parts per million (ppm) — a 50% increase since the start of widespread industrial activity in the 18th century.'
'the eventual warming for 407ppm CO2 will be about 3.5°C'
~James Hansen (who hasn't given up)
3.5°C is horrific, hard to survive. We must suck carbon from the atmosphere, but forests are losing their ability to do this. Industrial methods seem unfeasible.monthlyreview.org/2019/02/01/mr-…
1. Carbon dioxide was below 400 parts per million for the last 15 million years
2. CO2 levels are now 418 ppm and rising fast
3. Some scientists say we’ll probably hit +550 ppm which may well mean unsurvivable levels of warming
4. We can still take emergency action
We need to move away from today's economic growth paradigm according to the IPBES. This is an ecological crisis due to capitalism, which is tied to ongoing imperialism and colonialism. Immediate emergency political-and-economic-system-change action needed. mashable.com/article/climat…
'If the build-up of CO₂ continues at current rates, by 2080 it will have passed 560 ppm – more than double the level of pre-industrial times.'
if CO₂ reaches and stays at that level there is 'up to an 18% chance that temperatures will rise to 4.5°C'. theconversation.com/just-how-sensi…
3. 'Joe Biden's new NASA chief climate change adviser' is a dig at journalist-speak - 'chief'? hackneyed rubbish!
4. Surely we *should* now be prepared (materially, psychologically) for the possibility/likelihood of approaching or just over 3C? my mistake?!
5. There is every reason to think 2.3C will not protect biodiversity meaning billions will be at risk - if @ClimateOfGavin really isn't clearly prompting people to think that, it may mean they've not been informed about the ecological crisis by media, schools, governments, etc
1) Earth's climate is set to suddenly revert back to that of 3 million years ago by the 2030s
2) 18 of the 37 highly dangerous climate change tipping points in IPCC models will then be triggered
3) humans have never experienced anything like this
4) we can still act
Climates like those of the Pliocene as soon as 2030, likely by 2040 (Mid-Pliocene: 1.8°C-3.6°C).
'Both the emergence of geologically novel climates and the rapid reversion to Eocene-like climates may be outside the range of evolutionary adaptive capacity'!pnas.org/content/115/52…
We're heading for 1.8-1.9C, using a 1750 baseline, by the 2030s (or even using a 1850 baseline.. 2C by 2034 is shown as possible by climate models).
'With global temperatures already about 1C higher than pre-industrial levels, Queensland’s Great Barrier Reef has been through three mass bleaching events in only five years'