Today, the prime minister is expected to make a series of announcements on the “green recovery.” I am sure it will be optimistic but it will not be sufficient.

Major investment from the government is absolutely necessary, but it must be backed up in the coming weeks and months by a clear roadmap to net zero by 2050, which tells the public and businesses what to expect, when, and who is going to pay for it.

To work, clear carbon pricing must be a major part of that roadmap: it is a powerful lever, increasingly adopted internationally. More important, it can win public support. Without that, policy inevitably fails.