It’s hard to convince people who have made up their own mind. I’ve posted links here before. It’s a complicated matter, but there is material that addresses this. Just search “compost greenhouse emissions”.
And note that my statement also included restoring native plants. We cannot survive on agriculture without pollinators, and given that forest cover has been reduced from around 70% to 20% in less than a century, it’s not hard to believe. Just look around you and notice the expanse of lawns around you. Lawns do almost nothing. They don’t support wildlife, pollinators, and they don’t capture carbon.
And like I said, this is something people can do now. People can’t magically start driving electric cars fueled by green energy or start driving substantially less or rework city and nation transportation infrastructure. It’s actually debatable how much electric cars will reduce emissions. I think it’s not much. Same for so-called green energy.
The benefits of composting and retiring native plants are undeniable.