I highlighted some funny signs earlier. These signs are deadly serious. We are putting poison in the earth and we need to warn whatever people are left about the danger. How do you communicate to someone who won't speak your language? This is similar to the Pioneer Plaque, but the audience this time, hopefully, is human.
I have found it helpful to do the stretching exercises my physical therapist recommends. Do some core strengthening exercises, such as the ones highlighted at The Mayo Clinic. By keeping your core strong, your back won't put itself in a position to cause that sciatica pain you are having.