If you want to get people to reduce car use, then it requires government funding to fund additional and new public rapport services and routes, and subsidise it to make it more affordable.
The government could force retailers and manufacturers to print on all labelling and packaging the CO2 / methane / water used to produce a product or food. It would help people make more informed decisions.
The government could tax producers more for having comparatively higher environmental impacts to encourage them to use more sustainable production.
Companies literally do the bare minimum required, but taxing and charging for unsustainable products does work! Look at how the plastic bag tax changed consumer habits and now you see lots less of them littering everywhere.
The government could introduce higher sustainable building standards, retrofit schools and public buildings with bio solar roofs, or micro generator wind turbines could be installed on public land.
The government could build more reservoirs, and invest in wetland habitat creation. Invest more money in flood defences, prioritising nature based solutions.
The government could tax private jets much more, and phase out petrol diesel cars much sooner than proposed and invest in upgrading electric car charging stations.
The government could stop the development of new homes in areas that are water stressed and build new cities in areas that have enough water and space for environmental infrastructure.
The problem is the that governments are elected every 4-5 years, so it’s always in their interest to kick long term solutions into the long grass… which is why we are where we are now!
20 years ago councils across the country signed the Nottingham declaration on climate change which mandated all homes to have high water efficiency and all developments of 10 or more homes would have solar panels.. councils signed it, had a nice story and photo but never delivered it!
If the government had made it mandatory in the planning system, it would have happened!
Thats why government action is essential, because the above list of interventions would have far more impact than anything that individuals can do, and drive positive change in all individuals.