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Katharine Hayhoe @KHayhoe
, 3 tweets, 1 min read Read on Twitter
The second volume of the 4th US National Climate Assessment is now live. It lays out exactly how climate change is affecting every region and most sectors of the US: nca2018.globalchange.gov
The State of the Carbon Cycle report was also released at the same time. Just a reminder that the human-caused imbalance in the natural carbon cycle is the number one reason climate is changing. carbon2018.globalchange.gov
If you’re wondering where I’ve been, the answer is ... proofing at warp speed when the launch was moved up two weeks! amp.usatoday.com/amp/2080298002
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Looking for more science in your 2019 timeline? I've updated my list of over physical, natural and social scientists who study climate right here on twitter and there's over 2,000 of us now! Check it out, follow the list, or choose a few of us to follow. twitter.com/KHayhoe/lists/…
If you're a scientist who does climate or you know someone who is and *they are not on the list already* please let me know! Here's how to check if you or someone else is already on a twitter list: uhurunetwork.com/how-to-find-ou…
The criteria for being added is that you're an active researcher in a related field *and you have something in your bio about how your work relates to climate (or sea ice or glaciers or SLR)*
Read 3 tweets
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One of the most frequent arguments I get is, “it’s been warmer before.” But those who do so fail to realize that (a) climate scientists are the reason they even know this in the first place, and (b) those who know most about it are most worried about implications for the future.
And right on cue, exhibit A. We get this nearly every single day.
cc @rpancost
That’s a truly impressive list of myths packed into two tweets; screenshot to use as an exercise for my class :) Adrian, I’m guessing you’re not interested in truth that might conflict w your political ideology...but on the off chance you’re open, pls see: skepticalscience.com/argument.php?f…
Read 3 tweets
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What many fail to realise is that our science is often biased ... in the direction of being too conservative.

Exhibit A: the unprecedented nature of current warming (thread)
Exhibit B: just how exceptional the present-day atmospheric CO2 level is. Left, from NCA4 Vol 1, published in Nov 2017. Right, one year later.
Exhibit C: how quickly sea level rise is accelerating climate.nasa.gov/news/2680/new-… and risk of sunny-day flooding is increasing
Read 5 tweets

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I was in my last year of high school in '97 and the Howard Government was campaigning and lobbying world leaders against an emerging climate change deal, as revealed by the 96/97 cabinet papers naa.gov.au/collection/exp…
Cabinet submissions and decisions on #climate change in the first 18 months of the Howard Govt are notable for not mentioning the impacts or consequences of climate change at all....
The motivation that kept Oz reluctantly involved in the Berlin Mandate negotiations that led to the adoption of the Kyoto Protocol was international ostracism and the fear of trade sanctions if it was recalcitrant
Read 7 tweets
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Volume II of the Fourth National Climate Assessment and the United Nations Intergovernmental Panel on Climate Change Reports were recently released. We are reminded that we must take swift action to combat and reduce the impacts of climate change.
nytimes.com/2018/11/23/cli… (1/4)
Our administration through @GovernorVA leadership is taking bold action to slow climate change and reduce its impacts. (2/4)
We have drafted a rule to reduce power plant emissions. We issued a groundbreaking Executive Order to increase Virginia's resilience to sea level rise, natural hazards, and have announced our intent to regulate methane emissions. (3/4)
Read 4 tweets
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Just returned from Bangkok, where nations made little progress towards finalising the Paris agreement on climate change that aims to limit global temperature rises over the next 80 years.

It was my first @UN #climate change rodeo and there were a few things I wasn't aware of
Under Paris, countries agreed to a fairly detailed set of promises to keep global temperature rises under 2C by 2100.

It was the first time all nations - both developed and developing economies - signed up to the same set of climate rules. But they weren't binding
Parties gave themselves in effect 3 years to come up with a text agreed by everyone, ratified, and translated into national law on a state-by-state basis. The idea is the accord isn't legally binding, but the rulebook it provides could be on a national level
Read 23 tweets
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Late last night veteran #climate journalist @Revkin asked some sharp questions about @Sierra_Magazine’s “The Case for Climate Reparations,” spurred by an appreciative post from NYC Chief Resilience Officer @dzarrilli. Here’s my response …
My essay is only concerned with climate change-related damages in the US spurred, as I argue, by US actors like the oil majors. I could’ve written about Peruvian villagers suing a German energy giant & melting glaciers in the Andes, but that’s beyond the scope of my article.
So I had to identify extreme weather events in the US. As NOAA has reported, 2017 was the most destructive year on record for “natural” disasters. See this tracker ncdc.noaa.gov/billions/summa…
Read 21 tweets
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Good questions @RedsforNamesake. If confronting #climate change is your priority, it is imperative to ramp up carbon-free energy asap.

1. NJ will now ramp up renewable energy from 13% in 2017 and 20% by 2020 under old RPS to 35% by 2025 & 50% by 2030. Impressive leadership.
2. To ensure that this new clean energy replaces fossil fuels and contributes to #climate mitigation goals, NJ's new laws also make payments to ensure the continued operation of 3 South Jersey nuclear reactors that currently supply 31% of the state's electricity consumption.
2. Cont.: That measure is essential and ensures that nearly all of the new clean energy growth over the next 12 years builds on top of the fossil-free foundation provided by the state's existing nuclear plants.
Read 14 tweets
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Short thread.
1. I didn't realize how badly Trump has eviscerated access to federal #climate data, so I went and looked at the USGS site.
2. In December, there were 5,932 climate science items linked there (9 were just pictures). Today there are 416 and 292 are just pictures.
3. In December 2016, 320 of those items were links to #climate data. Today, 0 links to data. 5,271 were web links. Now, 0 web links.
Read 7 tweets

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