PM says people to be given more time to switch gas boilers to heat pumps, and ban on sale of new petrol and diesel cars delayed

• What has Sunak scrapped and what do changes mean?

Climate scientists have expressed dismay at reports that Rishi Sunak is to row back on net zero commitments, arguing that this would be harmful not just environmentally, but economically too.

Prof Myles Allen, professor of geosystem sciences at Oxford University, said:

We haven’t heard the actual speech yet, but we all have to hope the PM is true to his word that he is looking for better ways to deliver net zero, not just slower ways. As we have found time and again in Britain, dithering costs money. The USA is seeing other countries’ faltering as an opportunity to get ahead. It will be sad indeed if we just see it as an opportunity to join the laggards.

It’s not pragmatic, it’s pathetic. This rolling back on emissions cuts for short-term political gain will undermine the transition to net zero and with it the future opportunities, prosperity and safety of the entire country.

Burning fossil fuels produces carbon dioxide which causes global warming which amplifies the consequences of extreme weather events, as we have so clearly seen this summer. Climate change will continue until we reach net zero globally, and we will then have to suffer the consequences of that warmer world for decades or more. It also matters how we reach net zero, not just when – delaying action means more emissions which means more severe consequences.