Makes no sense from a climate change perspective IMHO - I can't see why the government accepts it, except as a way of cooking the books to hit their own renewables targets.
From a carbon perspective, it may even be desirable to periodically harvest trees (not just better than oil/gas), but I think a lot more research needs to be done.
I don't expect that it would reach 100%, particularly as there are motivations to preserve the nuclear industry beyond power generation, but 50% seems a low estimate.
Even at 2am on a still night the UK uses a gargantuan amount of power and we haven't solved the "How do we manage that with renewables?" problem.
The only thing worse than the "not really enough" emissions reduction plans, is idle comments about how terrible they are without offering any better, more effective solution.
Reducing the UK by 50% is better than not. If every country didn't reduce because they "only" make up X% of global emissions, no progress would be made, period. The solution is to target 0 CO2 emissions, and work our way there one productive step at a time.
That said, it's still worth it to keep emphasizing the fact that things are going to continue getting worse for the environment. Otherwise, people will be shocked, angry and outraged and societal upheaval and violence are likely to result. Already, you see people are upset about the wildfires in California, or the influx of migrants from the global south.
It would be doubly sad (though perhaps some would call it poetic justice) if we lost our civilization as a consequence of destroying our ecosystem.
Please propose an alternative solution that does not involve time travel.
Yes, Climate Change is going to have a negative impact on the world regardless of what we do today. But if we don't do anything, that impact will be even worse!
In the meantime, those of us with the means to do so can buy cheap arable land (of the low yield potential, remote and so on) and plant a native forest there. If you're in the EU, the cost of doing so might be way less than you imagine, thanks to the Union heavily subsidizing forestation. My first order approximation is that fully offsetting the estimated emissions of my family would delay getting that damned flat downpayment by two or three years. Which I'm seriously considering.
We need to do both, or that impact is going to be even more catastrophic! We're already fcked, but every additional half degree of warming makes us significantly more fcked.