I would like to know what "fastest rate of grid decarbonisation" even means, because the UK is definitely not the nation with the largest share of renewable electricity production. I guess it measures how much energy production has transitioned from non-renewable to renewable sources in recent years.
I don't think it's a particularly cryptic measure.
The UKs peak carbon per kWh was at some point. Since then it's dropped at a percentage rate higher than anywhere else.
The biggest thing has been the elimination of coal even if it's with natural gas as it's a much cleaner fuel. It's still a fossil fuel, but burns with much less pollution.
