We have a certain amount of time and interest in the day; I’d rather spend time figuring out how to reduce the biggest polluters than rounding errors.
Of course we need to tackle the big Problems, but they need consensus and time. You can decide right now to not buy a new phone or reduce your average pageload by one megabyte.
It won't change the world overnight, but tackling climate change does not mean that we need to stop the largest polluter and everything else can go on as before. These changes need to be on every level and it is foolish to not start at the one you are at because "someone is worse than me".