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I just came across some great EV explainers from @AukeHoekstra. They are only short (<15 minutes), but effectively get across key messages.

The first two are great for anyone that wants to learn about different types of EVs, the next two get a little more technical...

1/
How do EVs & ICEs differ?

Two main issues:
* Motor: EVs win, much simpler & lighter
* Energy storage: ICEs win, gasoline / diesel very energy dense

On balance, EVs are starting to win (gains in motor more than offsets weaknesses in storage)

2/
What are the pros & cons of different types of electric vehicles?
- hybrids (HEVs)
- plug-in hybrids (PHEVs)
- full electric vehicles (FEVs, also BEVs)
- fuel cell electric vehicles (FCEVs)
(also comparisons with ICE & biofuels)

3/
How do different electric motors work?
* Induction
* Permanent magnet
* Synchronous reluctance
(compared to Brushed DC motor)

[I learnt a few things here]

4/
Ok, this one gets complex, but good to hear the complexity nevertheless...

How does the charging system work?

And a few stories of Auke running out of battery...

5/
Well worth watching. Even if you are an expert listening to the explanations & narratives are worthwhile!

And here is the link to the original thread

6/6
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More from @Peters_Glen see all

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Glen Peters
@Peters_Glen
One of the biggest problems with Border Carbon Adjustments (BCAs) is also the problem that is least discussed.

Equity.

@arvindpawan1 explains (plus many other issues)

technologyreview.com/2020/07/27/100…
1/
Whether it is the intention or not, BCAs have the effect of reducing output in developing countries.

That is, when rich countries apply a BCA, poor countries get lower GDP & rich countries get higher GDP. Typical! All BCA studies show this.

2/
BCAs are also against the spirit of the Paris Agreement.

The unique aspect of the PA was that countries would put forward NDCs, & other countries would accept them as sufficient. It is not a top-down Kyoto style agreement, it is a bottom-up style agreement.

3/
Read 11 tweets
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Glen Peters
@Peters_Glen
1. Will energy technologies grow exponentially until they reach "materiality" & then have linear growth?

A common perception, but what does history say?

[Short answer: Old technologies are growing exponentially (not nuclear), just slower due to crowding out effects!]

Thread...
2. There was a paper in @nature in 2009 that used a "materiality" concept to say there will be a slow switch to low carbon sources.

I have been wanting to update their figure for some time, & see if their "laws" were correct.

rdcu.be/b4MOE
3. They came up with two laws, essentially that technologies grow exponentially until they become 'material', then growth changes to linear.

This is used to argue that there are 'physical limits' to the growth of new (low carbon) technologies.

But what does the data say?
Read 14 tweets
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Glen Peters
@Peters_Glen
THREAD on Carbon Budgets

The 'Carbon Budget' is the cumulative CO₂ emissions from one point in time to another given a temperature limit, such as exceeding 1.5°C, reaching net-zero (~peak temperature), or to (say) 2100 for a 1.5°C scenario.

cicero.oslo.no/no/posts/klima…
2. The #IPCC #SR15 had different categories of scenarios.

The 'Below 1.5°C' scenarios never exceeded 1.5°C (no 'exceed' budget), but they all reach net-zero CO₂ emissions leading to a 'net-zero' or 'peak' budget (as peak cumulative CO₂ occurs at net-zero CO₂ emissions).
3. Most 1.5°C scenarios exceed 1.5°C, reach a peak temperature (over 1.5°C), & then decline back below 1.5°C (peak & decline scenarios).

How to define the budget? A net-zero budget is a clear definition, but corresponds to ~peak temperature (eg 1.7°C) & varies a factor of two!
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