I disagree and your comparisons aren't accurate. A more accurate comparison would he to say its like "I'm going to ride my bike to work once a week" or "I'll pick up trash at the local park once a week".

I don't have to view eating meat or driving my car an inherently immoral in order to recognize the objective negative ecological impact that those actions have, and to therefore want to engage in some form of harm reduction from time to time.