I'm copy pasting something because it's easier than writing it all again:
Though experiment:
Tomorrow is election day in your country. The stout environmentalists win control of the government and proceed to make the following changes:
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Carbon tax, which increases the price of gas, which itself results in an increase in shipping anything. It also directly raises the price of anything that produces carbon in its manufacture process, such as anything made of plastic.
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An end to meat subsidies - maybe even a tax on it - and an increase to subsidizing other types of farming.
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A ban on single use plastics.
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And anything else you think might be necessary.
Now the questions: How long until they get kicked out? How long until the protests and riots? How long until a new government undoes it all?
I’m assuming you’re not naive and you don’t live in a bubble. You should know the majority of people will not be fans of any of that; and with the way it usually goes and the pendulum swings, the government that follows it will be a far right one.
Most people can definitely afford to eat less meat and consume less in general, even if they can't afford to buy the most environmentally friendly things. And if they can't even afford that, they won't be able to afford the environmental policies either; you would need much deeper change than you would get by voting for a major political party.