A new target - an 80 per cent cut in CO2 emissions by 2050.

So the Government now wants to try and cut our carbon emissions by a massive 80 per cent by 2050.

Goodness, that's an ambitious target.

The previous figure was 60 per cent, following a cut of 20 per cent from current levels by 2020 - a tall order in itself.

Now, they are saying our nation will need to produce just one fifth of the CO2 it currently produces in just 42 years' time.

Let's get this straight. This is effectively saying that everything which produces CO2 emissions - energy production, transport, waste disposal and from our homes - will have to become eco-friendly by the middle of the century.

The 80 per cent figure may as well be 100 per cent - it is so huge that we will need a complete and radical change of attitude to achieve it.

How will this impact on the lives of Bristolians?

Well, the Severn Barrage, or an equivalent scheme of harnessing the massive tidal power of the estuary, would definitely have to go ahead.

Alongside it would be huge wind farms, as well as the new versions of the nuclear power stations currently at Hinkley Point and Oldbury.

We would all have to be driving cars driven on something other than petrol or diesel, perhaps electricity or biofuels.

Public transport would also need a much more stringent level of regulation to make it more eco-friendly.

And our homes would require a far higher standard of insulation to prevent extravagant heat loss and solar panels at the very least to provide power.

No doubt all these measures are very worthy and the importance of tackling climate change is not to be underestimated.

But I wonder who is going to pay for it all?