which constitutes the baseline of your assertion of RISING EROEI.
By the way - what exactly is your argument?
To start with, it's quite obviously not what you just stated is it, I've in no way ever asserted that EROEI is rising in oil at least, nor would I. It almost certainly is getting better for solar, but that's a different point.
What I'm disputing is your statements about liquids rising, but net energy falling.
I'm of the opinion that net energy from all liquids has been rising still over the last couple of years as volumes have risen, albeit by a lower rate than the increase in volumes.
Having checked your statement again, I've realised that you're probably also referring to the reduced energy content of Natural Gas Liquids and biofuels vs oil derived petrol & diesel, which I'd not factored in to my previous estimates.
I've set up a spreadsheet to try to analyse this, and even accounting for the reduced energy content of the liquids as well as the reduced EROEI on new production, a gradually reducing EROEI on existing oil supplies, and assuming your statements about an 8% decline rate for existing oil were correct, we'd still be getting something like a 0.7% increase in net energy content from the sort of annual rise in total liquid volume we've seen in the last couple of years.
So I'm still of the opinion that you're currently wrong to make that statement about net energy already falling, however I would accept that we're quite possibly on the cusp of the point where in oil (all liquids) terms we will end up with the possibility of rising liquid volumes, but reducing net energy.
However, if the IEA is anything like correct about the rise in tight light oil & crude forming the majority of the increase in volume though to 2018, then I still doubt this will apply.
I think NGL has made up around 50% of the increase in liquids over the last few years, which results in a significant reduction in energy content per volume, but the IEA has them making up less than 25% of the increase though to 2018, so this factor will apply proportionately less if they're right.
If the assumptions I've used were right, then for the 8% per year decline rate in existing oil, we'd be needing around a 1% overall increase in all liquid volumes each year to get and actual increase in net energy production from all liquids. This is very rough and ready though and it really depends a lot on the make up of the additional liquids.
I would be pretty interested to see any figures anyone else had produced on this though - have you got any links to anyone else who's done these calcs?