Everyone has to act and change their Livestyle…

I "kinda" disagree, because we have a lot of alternatives now. Some are more expensive, some need a bit more work, but the alternatives are there and are coming as well. And little changes can do good things, for example not eating Avocados is something everyone can do. If only 50k people stop eating Avocados, that's one hell of an impact in the rainforest areas. Because those 50k people don't eat one Avocado per Month, they eat a lot more (generally). A single Avocado Tree can produce 80-100 Kg per year and generally, avocados are somewhere between 500-900 g. So maybe 120-150 Avocados per year, per tree. Then there's meat - we don't have to stop eating it, we have to reduce and it would make a HUGE impact, especially considering Beef from Brazil isn't even that great, but the rainforest get's destroyed for it.

And so on. It even goes so far, that if people still want to drive their gas guzzlers, they can, but they need synthetic fuels which are expensive but 100% carbon neutral. So the Lifestyle does not need changing necessarily - it just needs some adjustments and especially more conscious consumption - especially in those countries, where capitalism is in "full effect" and where we "rich people" actually make impacts with our buying decisions. (Even if they are extremely small, if you tell friends you are doing things different, they may do as well)