10 to 1 the person you will be helping will get you to develop software that tells everyone not to eat meat and not to have kids. There are very few serious people in climate science.
I just don't think being a vegetarian has impact... it's something you do to keep consistent with your worldview or morality, not to mitigate climate change.
An individual's actions does have an impact, albeit a small one. It is measurable (CO2 savings from not eating that meat). Discouraging individuals from participating in individual efforts will prevent the group from achieving scale.