politics

This is not a problem of exports. The US eats way animal products more per capita. If everyone ate like Americans, we would need 137% of the world's habitable land which includes forests, urban areas, arable and non-arable land, etc. Cutting down every forest wouldn't even be enough

https://ourworldindata.org/grapher/share-of-global-habitable-land-needed-for-agriculture-if-everyone-had-the-diet-of

The land usage itself isn't free either. It comes with costs

Livestock farmers often claim that their grazing systems “mimic nature”. If so, the mimicry is a crude caricature. A review of evidence from over 100 studies found that when livestock are removed from the land, the abundance and diversity of almost all groups of wild animals increases

https://www.theguardian.com/environment/2022/aug/16/most-damaging-farm-products-organic-pasture-fed-beef-lamb

And that's not to mention the emissions which are enough to make us miss climate targets on their own if we ignore them. We must address fossil fuels and animal agriculture

To have any hope of meeting the central goal of the Paris Agreement, which is to limit global warming to 2°C or less, our carbon emissions must be reduced considerably, including those coming from agriculture. 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.

(emphasis mine)

https://www.science.org/doi/10.1126/science.aba7357

We can look at individual foods themselves

To produce 1 kg of protein from kidney beans required approximately eighteen times less land, ten times less water, nine times less fuel, twelve times less fertilizer and ten times less pesticide in comparison to producing 1 kg of protein from beef

https://pubmed.ncbi.nlm.nih.gov/25374332/

We can look at other modeling studies. Here's a review of modeling studies

Our review showed that reductions above 70% of GHG emissions and land use, and 50% of water use, could be achieved by shifting typical Western diets to more environmentally sustainable dietary patterns. Medians of these impacts across all studies [Including studies with just partial changes in consumption] suggest possible reductions of between 20–30%.

https://journals.plos.org/plosone/article?id=10.1371%2Fjournal.pone.0165797&emulatemode=2

We can also look at some specific modeling studies in specific countries. Numbers will slightly different from global picture since it is going to vary based on how much animal products are consumed there

For instance, here's one looking at France in particular

Vegans’ diet emitted 78% less GHG, required 53% less energy and 67% less land occupation than omnivorous’ diet. These results are in line with several recent works documenting associations between dietary patterns and a set of environmental impacts (GHG emissions, land occupation, and water use) in modelled and observed data (8,10,20)

https://www.sciencedirect.com/science/article/abs/pii/S2352550919304920

Here's another study modeling for Romania in particular (though does indirectly use some from numbers from Poore, Nemecek). Romania consumes roughly half per capita as somewhere like the US and still sees quite high reductions with removing all animal products

With the reduction of 100% [of animal products in diets], the largest decrease is observed, equaling a total of 11,131,127 ha, reducing land use by 733,898 ha compared to the 50% scenario and by a total of 1,067,443 ha compared to the baseline. This represents almost the cumulative UAA of two large-sized counties in Romania, Arad and Timis

https://pmc.ncbi.nlm.nih.gov/articles/PMC11722955/