1/9 I echo the @vsiv comment - may all public reps be as clear & thoughtful as @SeanCasten and as good at their jobs.

Of course, as someone cited in this article, I respectfully disagree on many points of his thoughtful thread Here's a few of my thoughts: https://twitter.com/SeanCasten/status/1291443249228517376

2a/9 Rep. Casten is incorrect about H2 storage. My former mates from @Livermore_Lab built a cryo-compressed tank in 2006. Gen 2 got 1000 km on a single fill in a Prius. Works great. Already used in many H2 vehicles on the road. https://www.llnl.gov/news/llnl's-prototype-hydrogen-storage-tank-maintains-extended-thermal-endurance

2b/9 Full review of cryocompressed tanks like those commercialized today was done at @argonne & can be found here:
https://www.energy.gov/sites/prod/files/2014/03/f9/cyro_compressed_auto.pdf

3/9 As many have commented, H2 is essential to decarbonizing industrial beat and feedstocks. Here, the value is we can’t electrify big parts of industry (22% of US GHGs). H2 today is most versatile, economic & available in bulk. For more, check out https://energypolicy.columbia.edu/research/report/low-carbon-heat-solutions-heavy-industry-sources-options-and-costs-today

4/9 Hydrogen can make fuels for shipping (like ammonia) which can’t be decarbonized with electricity. Already, the @IMOHQ is looking at this. One place to learn more is this new @cleanaircatf report: https://www.catf.us/2020/07/building-a-globally-networked-supply-of-zero-carbon-shipping-fuel/

5/9 For heavy-duty & long-haul vehicles, H2 is a strong contender for zero-C fuel. Part of the reason why: batteries take up 40% of the cargo space in electric long-haul trucks (like this one) https://www.nextbigfuture.com/2017/11/tesla-semi-truck-coming-2019-and-when-platooning-almost-half-the-cost-per-mile.html

6/9 There are certainly challenges to production of H2 from green power, including cost and infrastructure. These should not be ignored. They call instead for both innovation & infrastructure investments. The @ClimateCrisis report agrees: https://climatecrisis.house.gov/report 

7/9 Today, the best answer in most markets is zero-C “blue” H2 from gas ( #CCS). @SeanCasten is correct that you lose some efficiency in conversion. You also lose the carbon (!) that's the job.

We could reduce today’s H2 emissions about 400Mt/y this way, scaling fast & cheap

8/9 Punchline; @SeanCasten is right to be challengethe #HydrogenHypeCycle. Deployment has issues: cost, infrastructure, policy, value, utility & speed. His points have merit.

They’re also all addressable. #WeGotThis with focus & investment

9/9 Hydrogen is the Swiss Army Knife of deep decarbonization. We need to advance zero-C hydrogen deployment with speed, determination, care and humility. This is a chance for America to lead.