Luckily because we are omnivores, enteric fermentation...

Luckily because we are omnivores, enteric fermentation https://en.wikipedia.org/wiki/Enteric_fermentation isn't exaclty present inside humans. There has been studies ie in Australia funnily enough which tried to "capture" the farts / burps from sheep. Yikes the photo doesn't look comfortable at all..............

In general though, as you said, there is too much population.
I agree with this exerpt from your quote, just not about the farts / burps part from humans .

Sadly meat consumption is on the super rise, since the Western world seems to hold meat extremely highly. https://en.wikipedia.org/wiki/List_of_countries_by_meat_consumption

Countries by meat consumption per capita

Country	kg/person (2002)[9][note 1]	kg/person (2009)[10]	kg/person (2017)[11]
United States of America	124.8	120.2	98.60 (-18%)
Australia	108.2	111.5	94.61 (-15%)
Argentina	79.7	98.3	91.40
Uruguay	98.6	55.3	81.04 (+47%)
Israel	97.1	96	80.35
Brazil	82.4	85.3	78.60
Netherlands	89.3	85.5	76.60
New Zealand	142.1	106.4	72.14 (-32%)
Serbia		45.2	72.1 (+59%)
Chile	66.4	74.1	71.97
Canada	108.1	94.3	69.99
Russia	51	69.2	60.66
South Korea	48	54.1	55.89
Malaysia	50.9	52.3	54.75
Saudi Arabia	44.6	54.4	54.05
Vietnam	28.6	49.9	52.90
Paraguay	70.3	41.9	52.68
China	52.4	58.2	50.20 (-14%)
South Africa	39	58.6	50.17

You can see above per person, the US/Australia/NZ from 2009 to 2017 has REDUCED??? meat consumption per person by 18%, 15% and 32% respectively. Hope this trend continues.

Interestingly for China, per person from 2009 to 2017, meat consumption has REDUCED by 14%.