Sadly, I think Debbie is right.
gas production will fall annually by 8.1% before the fossil fuel is completely phased out by the power sector in 2040
The group I'm most active with is focused on a price on carbon. That is essential, but I'd say that last date it which that was sufficient was in the 1990s.
It's all about the brutal math of the S-curve. At first, it takes a while to really hit your stride. Then you start decarbonizing fast and hit the steep part of the S-curve. Then things get hard (air travel, rocket ships, legacy industry) and the S-curve flattens. The longer you wait to start, the steeper the steep part of the S-curve has to get.
If we had started decarbonization on 1992, I think the peak of the bell curve would have been less than 5% in peak reduction years with most years more like 2-3%. We could have done that while expanding the global economy.
Now the peak year in order to stay below 1.5 degree C rise is probably closer to 20%. The Australian govt did a study on this around 2011 showing what the impacts of each year of delay are on how much harder it gets and how steep the curve gets in the middle of the process. My faulty memory tells me that if we didn't start serious reduction until 2021 it would go to 17%. I would need to check that though.
Every year that we make little or not progress, the steep part of that curve gets steeper for two reasons. First, the carbon budget is smaller. Second, the timeframe is compressed. So the steepness increases faster than you might think. It's very similar to bankruptcy. Every year you spend down your account, you have less money to work with and your budget reductions have to happen even faster. It's a double-bind.
So 8% seems like a reach, but 8% implies a steep part of the curve where reductions are 2-3X that amount. There is no way we'll see a 20% reduction in a single year by our own volition (asteroid strike will do it, but not a mere pandemic lockdown).
My sense is that by the time people truly cotton on to the fact that the *cost* (setting aside any moral/ethical issues) of global warming is very high, they will be surprised by the brutal and fundamental math of the S-curve.