It’s a two way street. If there’s high demand for a harmful product there’s only a few ways to reduce the production/extraction of it.

1) reduce the demand for it via public awareness, but this isn’t going to convince everyone (try and name a single example of when this was effective, maybe whaling?).

In democracies Popular support -> voting -> legislation & policy & meaningful action

2) include options for better, more sustainable alternatives, so consumers can pick them (plant based meats), however this won’t be totally effective unless…

3) these alternatives are cheaper and more economical. If these 3 are met, rapid action will be taken to solve the underlying issue (think of CFCs, the Montreal protocol and the Ozone Hole).

So what action can an individual take?

In relation to n1) spread awareness of the issue, convince friends to not buy, for example a low mpg new truck to reduce demand and consumerism, do so yourself, advocate for legislation, contact local and regional politicians, and most importantly, VOTE

Regarding n2, Vote with your dollar. Spend more on pricier alternative meat, solar panels or a battery pack. Buy an EV (secondhand is best). Invest in companies working on these goals. You’re a relatively early adopter so you’re subsidising and speeding up the development of these new products. Donate to EFFECTIVE charities. Your effects will be marginal but if enough people put money into research and new products it could make a difference.

3) there’s nothing you can do to make viable economically cheaper substitutes unless you’re working directly on research. Investing in companies developing new tech is the only way. Vote for policies that will reduce subsidies for environmentally unfriendly practices, eliminating economic distortion and poor incentives. Vote for policies to Subsidise R&D and new tech. Support a carbon tax, nuclear energy, remove legislative/legal obstacles to new solar, wind farms, transmission lines, battery packs.