When your parents had you, the world was decisively a worse place. Especially if you were born prior to 1989. Why wouldn't you want to bring a child into the objectively best times of human existence to date?
For a hypothetical "Worldwide Average Person," things are quite better today than at any point in history. There are a lot of people who were dirt poor yesterday and are now less dirt poor today. For a small number of very well-off people, things are exponentially better today than ever. But for a significant number of people who had it really good in, let's say the 1950s and 1960s, things are noticeably and measurably worse in all ways today. If you're one of these people, the "Well that average person over there in Indonesia is better off" argument isn't convincing.
My thinking is there will always be something. Our parents could have said the same thing about Vietnam and the Cold War. My litmus test is: "is this issue affecting you". Global warming and wars may make you anxious when reading the news, but does it _actually_ affect your life.