There are a million problems in the world, you have to focus on them one by one. It is true, petrochemicals are bad and mined metals are also a problem and we should not ignore those issues but we are allowed to talk about one specific issue at a time.
Also, some issues are more accessible on a personal level and some are not. I cannot make all the world wars stop, but I can stop eating meat and eggs and dairy and therefore stop participating in that suffering.