Actually, the impact on climate is very very little. If the whole US would go vegan it would only decrease the total carbon emissions of the US by a little over 2%, the methane emissions would stay the same.
I haven’t quit meat, in fact I love it, but I will never support ethically bad living conditions for the animals. I only buy buy meat from animals that live free roaming with access to stables, even though it’s expensive where I live (about $ 20 per pound of cutlet)