Agitate and vote for the most left-wing party you can (that has a realistic chance of winning/influencing an election). Campaign for them to institute a ban on fossil fuels. Protest. Climb smokestacks. Make headlines. Break the law. If you work in the media, subvert their agenda as much as possible. Capitalism is crisis.
Of course, the BBC would never state these things. But given how little has been achieved in the last 40 years by playing by the rules, at this point they are obviously necessary, if not sufficient.