Another problem which will not be considered a problem big enough for who is causing it but then which will bite us all in the butt in 25-50-100 years and then

Another problem which will not be considered a problem big enough for who is causing it but then which will bite us all in the butt in 25-50-100 years and then it is going to become everyone's fault. I'll nickname them as "Anthropogenic Meterorites" (unless they already have a name.) I will also be the one starting the debate that I don't believe they are actually man-made, meteorites have been falling forever and there is no scientific consensus it's our fault.