This is how you impose an unpopular and ineffective environmentalist policy that will hit the poorest citizens hardest, is bound to create a host of unintended consequences, and is founded on speculative science to begin with.
You are a centrist government in a democratic Western country. You want to be seen to be taking action on the environment, but you believe in consumer capitalism, and therefore wouldn’t dare to dismantle the profit-making machinery that actually contributes most of the CO2 within your economy. You praise the ideals of the Green New Deal, only because you know it will never become reality.
Your target must be insignificant economically, yet high-profile in its symbolic value. Meat works perfectly. Eating it already has an aura of hedonistic licentiousness, and restricting consumption covers several bases – animal cruelty, public health, and most importantly, climate change resulting from intensive livestock farming. You will get years of headlines, just as when you banned plastic bags or forced people to pay deposits on plastic bottles.