The world currently relies on fossil fuels for 80% of its energy. All the time most UK people have a gas boiler, a diesel or petrol car, eat meat and rely on products that need plastics, steel, ceramics, cement and other components that need plenty of energy to produce we will help create CO 2. Our choice is do we use more of our own coal, oil and gas, or import more? If we import more that will entail more CO 2 being generated worldwide to fuel the transport of products. It will mean fewer well paid jobs in the UK and less tax revenue.
Importing more fossil fuel or fossil fuel using products is a kind of self harm, not a policy which saves the planet. Transition to a carbon free future will occur at the pace the public dictates by all our choices on what to eat, how to heat and how to travel. It is a strange argument that we should not allow onshore gas in the UK yet it is fine to import it from the USA to keep us warm. It is odd some think we can import coal to keep the lights on but should not produce specialist coal of our own.