Just one? I'll do you a few better...

• The Falcon 9 rocket put a hole in the ionosphere

• Falcon 9 makes use of kerosene, which puts black soot into the atmosphere (if they used solely liquid oxygen or liquid hydrogen the only thing left would be water vapour)

• Serious damage at a Texas base (caused craters and debris to scatter around remote cameras)

• An explosion on the launch pad during a test caused damage

• Boca Chica...

  • Massive amounts of dust, which contain toxic shit

  • Destroyed the launchpad (scattering large chunks of concrete into delicate marine and coastal sanctuaries nearby)

Edit: fixed up formatting