Could be any number of things. For example, Solar activity has massively increased. The temperature could easily be oscillating in line with increased activity from the Sun.
Fossil fuels are an incredible thing. The ability to cheaply store, transport and use energy has given us everything that we hold dear. From an engineering standpoint they are a marvel.
Lets say the argument about man made global warming is 100% confirmed, and I agree with you. I still strongly believe the way that governments are brandishing fossil fuels as evil is deeply harmful not only to the UK but also to the world.
By branding them as evil and setting insane emissions targets, how many millions of people globally will lose access to electricity, water, hospitals etc.
All I am saying is that the push for green energy is fraught with its own dangers and problems, and the current conversation totally overlooks this.