We Haven't Got 700 Years?

I suspect that it will not have escaped anyone's attention that we have nothing like 700 years to do something meaningful about climate change, if we want to retain an inhabitable planet. So, it is a bit bizarre to read that, on it's current trajectory, that's how long it will take to get UK homes into the government's promised 'low carbon' heating regime (https://www.theguardian.com/environment/2020/oct/08/uk-will-take-700-years-to-reach-low-carbon-heating-under-current-plans). Getting to this stage, would involve changing the way in which homes are heated. We would have to rapidly away from non-replaceables (like gas, coal and wood) and actually deliver energy provision via wind turbines, solar panels and geothermal systems. We would also have to substantially improve home insulation. Many of these changes would clearly have to be mandatory for any new builds, which would increase pricing. Changing what is already in place would be a substantial challenge. One of the signs, indicating how far offtrack we are, is the observation that last year saw a record rise in the installation of new gas boilers. These would have to be phased out, well before reaching the end of their working lives.