If we don’t allow the Rosebank oil field go ahead we will buy more oil from abroad, how is that saving the planet?

If don't go ahead with it but generate our power some greener way, we won't be contributing so much to the changes which are making El Nino alter the Gulf Stream and send extreme weather to our shores. It might make little difference in our time (I'll be surprised if I am still around in ten years to see any) but our children and grandchildren may be glad we held firm. The children and grandchildren of Putin and Trump will probably be cursing them (or in Putin's case, blaming us for it, as they are being told that everything is the the fault of "the West".)

In any case, it takes ten years to get new drills on stream and producing enough power to be worth the cost. By then, there could well be several new methods of generating power. There is a lot of research going on.

The research has been going on for years. Too much talk and not enough action. All that hot air could have generated a lot of energy!

I think the term is green washing

We clean up our act, then import goods, fuel etc from around the world. All those air miles on polluting container ships…

Because we're not actually going to get this fuel. It will be sold on the open market making a shed load of money for the oil companies. This is lose lose for the general population.