The research paper is linked in the BBC article. The paper covers more than just changes to diet (less meat, more plants). The diet issue is highlighted in the BBC report because it is presumably the most contentious.

The paper looks at difference ways to influence or change the behaviour of the public. Some examples from the paper below. These are higly selective extracts, but I highlight them because they do realistically highlight the opposition (or inertia!) to be expected from many of us.

Diet changes

> Asking people directly to eat less meat and dairy is a major political challenge, though positive framings and smaller asks may be possible (e.g. learn one new recipe).

>...narratives must avoid alienation of mainstream dietary choices

Home retrofits and energy transitions

> Information provision alone tends to yield very small behaviour-change impacts in energy consumption or technology adoption...

Aviation

> There will be limited political space to directly ask the public to fly less in the short-term.