Trump: "we have now the lowest carbon"

Science: we have now the highest carbon dioxide levels in the atmosphere in 15 million years and the highest carbon emissions from humans ever. In the U.S., carbon emissions WERE ticking down, but headed back up in 2017. Source: EPA
It is furthermore, as one who has worked and published on methane emissions in the past, plausible that the CH4 emissions in the figure above could be under-estimating natural gas leaks. See: @howarth_cornell and… and…
And in terms of global carbon emissions, as far back as scientists can go in the paleo record, the closest analog to today was over 50 million years ago and at that time best (tho v rough) estimate of avg annual emissions = only about ONE TENTH of today's.
Finally, regarding the temporary drop in carbon emissions due to the coronavirus lockdowns:
Oh and I would be remiss not to mention that climate responds to CUMULATIVE emissions, not annual emissions. There again the U.S. is number one. Source:…

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More from @KHayhoe

9 Nov
The science carnage of the Trump administration continues, unchecked by the recent election.
Read 4 tweets
3 Nov
It amazes and saddens me how many people are willing to let some of the richest multinationals in the world off the hook when it comes to carbon emissions and blame themselves + other individuals instead. "We're the consumers" say the drug addicts, "so it must be our fault." Image
Guilt can be a powerful motivator of societal change, yes ... when those who feel that guilt have the power to effect change at the scale that would mitigate that guilt. When it comes to carbon emissions, tho, the fact is that we as individuals DON'T.
That is why, as @MichaelEMann explains so clearly and lucidly here, we need system-wide change.…
Read 7 tweets
2 Nov
Royal Dutch Shell is #6 on the list of 90 companies responsible for 2/3 of greenhouse gas emissions since the dawn of the industrial era. Their cumulative emissions equal those of the country of 🇨🇦.…
Yes, everyone must do their part - starting with the biggest emitters. That means you, @Shell.
Despite what the CEO of Shell claimed in 2019, eating food that's in season, avoiding fast fashion and recycling ISN'T GOING TO CUT IT when it comes to stabilizing climate change. Those actions will make no more than the tiniest of dents.…
Read 4 tweets
28 Oct
Press release from the White House Office of Science and Technology Policy claims science + tech highlights of Trump's first term include "ending the covid-19 pandemic" and "taking action to understand and protect the environment."…
The truth? The Trump administration has or is in the process of rolling back over 100 pieces of legislation that protect the "clean air, clean water, and resilient environment" the press release claims to have protected. Source:…
The Trump administration also deliberately misrepresented the findings of the National Climate Assessment and just this fall hired new appointees who explicitly reject the science to "consult" on the NCA process in the future.
Read 4 tweets
27 Oct
US DOE has blocked reports for more than 40 clean energy studies. “There are dozens of reports that can’t be published,” said Stephen Capanna, former director of strategic analysis who quit in frustration in April 2019. h/t @dan_kammen cc @SolomonG_R…
.. while claiming that energy efficiency - a powerhouse win-win solution which could reduce US carbon emissions a whopping 50% and save $700B - is all about making people's windows tiny (?!)…
... and that wind energy, which supplies 20% of Texas' electricity, is a bird killer. Well sure...but compared to fossil fuels, windows, and cats? It's quite literally microscopic; plus there's lots of cool new tech to reduce wind bird deaths further.…
Read 5 tweets
25 Oct
Mrs. Eunice Newton Foote (1819-1888) was a women's rights advocate & pioneering scientist. In 2020, @EarthSci_Info + @Roland_Jackson reanalyzed the data from her groundbreaking 1856 study to show you could estimate a climate sensitivity of 2-3C from it!…
Climate sensitivity is the equilibrium change in global mean temperature resulting from a doubling of CO2 relative to pre-industrial levels. It's usually represented as a probability distribution with a mean value around 2.4-4.7. Here is a recent review:…
Why don't we know the value for sure? Because we've never seen this much carbon going into the atmosphere this fast with these precise initial conditions. We are conducting a truly unprecedented experiment with our planet.…
Read 8 tweets

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