There've been arguments made that the Syrian Civil War was sparked over farmers revolting due to ahistorical droughts. I can't speak to their validity, but the first of many may have already happened.
You could also argue the same about Kashmir; it's not so much about ancestral homelands as water rights.
Yet the last thing anyone worries about during war is pollution. Resource usage goes way up, tycoons get richer. The poor and young are sacrificed.