Development has stopped to to I2C stretching bug in the Raspberry Pi's BCM2835 chip. More information can be found here: https://elinux.org/BCM2835_datasheet_errata#p35_I2C_clock_stretching
I would highly recommend paulvha's SCD30 pi library which was released earlier this month! It gets around the bug by using bitbanged I2C connection via another one of their libaries, twowire. I will link it below.