Aprox 45% of global emissions come from:
- Generation of electricity and heat.
- Burning of fossil fuels at factories, mines, etc, to produce energy on site.
https://www.epa.gov/ghgemissions/global-greenhouse-gas-emiss...
Moreover, we aim at reaching net carbon by 2050. This means that we need to cut on everything. So the question is about how easy it is to reduce such budget and how efficient this cut provides.
In this perspective, zero waste is a bad trade off for climate change (a lot of efforts and only a 100 kg saved per year). Vegetarianism (or better veganism) sounds like the best thing to start with.
Everything is using energy.
Transportation is not included in the 45% (check the link in my previous comment). And AFAIK we also need to transport vegetables, using machines for agriculture, etc.
> Vegetarianism (or better veganism) sounds like the best thing to start with.
Objectively, chicken and pork have much lower emissions than beef.
Also, removing beef consumption would increase consumption of other foods so the emissions reduction wouldn't be as drastic.
Well, since you have a factor between 10x (cereals) and 100x (legumes) in the CO2 emissions between beef and vegetables, yeah it does drastically decrease emissions.
> Objectively, chicken and pork have much lower emissions than beef. Right. However, pork is mostly fed with cereals, inducing a high level of CO2eq/kg + land use + loss of diversity.
I highly recommend watching for more details. https://www.youtube.com/watch?v=SdrhpThqlCo