The most positive climate impact you can have is not having a kid, not having a car and not flying, in that order.

I do not have any kids, that’s why I don’t have to worry about your attitudes. But it is not a single thing we have to change, it all has to change.

Transport accounts for around one-fifth of global carbon dioxide (CO2) emissions …Aviation – while it often gets the most attention in discussions on action against climate change – accounts for only 11.6% of transport emissions.

Food is responsible for approximately 26% of global GHG emissions.

Research suggests that if everyone shifted to a plant-based diet we would reduce global land use for agriculture by 75%

Clark et al. show that even if fossil fuel emissions were eliminated immediately, emissions from the global food system alone would make it impossible to limit warming to 1.5°C and difficult even to realize the 2°C target. Thus, major changes in how food is produced are needed if we want to meet the goals of the Paris Agreement.

Where I live meat production goes down already, but you not having a kid will not change anything because you not getting laid was so predictable that every climate model considered it already.