This has puzzled me for years:
The general public has a major lack of understanding of how eating meat and dairy contributes to climate change, according to a survey of Europe, the Americas, Asia, and Africa by the market research organization Ipsos MORI. Although meat and dairy production accounts for roughly 15 percent of total global carbon emissions — equal to exhaust emissions from the international transportation sector — less than 30 percent of survey respondents identified meat and dairy production as a major contributor to climate change. More than twice as many — 64 percent — said transportation was a major contributor.
Interestingly, many people are aware that deforestation contributes to global warming, but don’t apparently don’t connect deforestation to clearing land to run livestock.
I guess the meat and dairy industry has a better PR team than the oil and gas companies.