I'd argue that the concept of a carbon footprint is not, inherently, a scam. You do have an impact on the world. Your carbon footprint is a real and genuine measure of that impact. And taking actions to reduce your carbon footprint is a way to mindfully track, measure, and reduce that impact.
Oil company propagandists may have used this real thing - your carbon footprint - to shift blame away from the oil companies and redirect people's efforts to reducing individual consumption instead of working for political change. Which is bad. But the carbon footprint, itself, is not a scam - just the uses to which big oil put it.
Plastic recycling, on the other hand, is fake industry propaganda from start to finish.
And honestly, if I'm on my soapbox, I'll remind everybody that "reduce, reuse, recycle" is in order of preference. Recyclable paper bags may be better for the environment than single use plastic bags, but bringing your own reusable cloth bag to the grocery store is even better. Just because a single-use product is recyclable doesn't make it environmentally friendly.