solar panels actively reduce CO2 emissions every day they are in use. They only pollute if they are dumped irresponsibly after their ~15 year service life. why

solar panels actively reduce CO2 emissions every day they are in use. They only pollute if they are dumped irresponsibly after their ~15 year service life. why would it be good to forego something that reduces emissions now, in order to develop recycling for something that won't be discarded until 15 years?