If we're seeking to halt climate change, it seems quite reasonable to look at effective measures for that. If decreasing methane emissions from landfill or farming might contribute, it seems odd to write those things off. This is partly due to the way we silo investment in the west: there isn't an organisation that is a single point of coordination and can make the tradeoffs logically. So for better or worse, we should try to make those tradeoffs wherever we can.

To riff off your programming analogy, climate action is like a program that requires a thousand complicated, interdependent functions to be written for it to do its job. Unfortunately in our analogy, virtually none of them ever speak to one another, so the process will be hard, some people will try to bypass other people's contributions - even if they're better - for want of understanding, and the whole thing will be an organic mess.

The difference is, if the program doesn't do what it says, that's kind of fine. If we don't meet or exceed carbon goals, many people around the world are likely to die.