Some practical ideas, to follow on from the above:
See if you, in your household or business, can move to a green energy tariff. Ovo are big players here but there are others.
Minimise journeys made by car- this often requires a more wholesale lifestyle "review" - cutting down what you try and cram into the day, choosing walkable schools etc
Make your own green space whether it's a window box or garden as biodiverse as possible- yes there's No Mow May etc but you can consider what you plant too
Cut down or eliminate meat and animal products, especially beef. Going fully veggie isn't an option for everyone but cutting down to 6 days a week, then 5 etc will make a difference.
Limit flying
Look into projects such as Climate School 180 / Let's Go Zero and ask local schools to engage
Follow the 5 Rs for consumption of products - Refuse, Reduce, Reuse, Repurpose, Recycle
But ultimately, while we live in a world where Exxon Mobile alone emit 100 million metric tonnes of carbon dioxide per annum this is all basically a vanity project to make us feel better. Lobbying the government (or supporting organisations that do) is likely to be more impactful, though personally frustrating, deflating etc.