One of the best bits of advice posted in a long while; doing a service wash (with or without detergent) will also lengthen the life of your machine (thus making the carbon footprint increase of doing a boil wash be much lesser than the footprint of re-manufacture)
The proof of doing a service wash without adding a soap is amazing. Also pour just-boiled water down the detergent drawer to clean that delivery route
In a basic description a detergent leaves a water-loving layer on the garment (thus why there is not a need to perform the double rinses of pre-modern detergent days: think old twins tubs). Anyone who wants to have their waterproof jacket left with a water-attracting residue on its surface should know better (you are encouraging wet-out)
People should also consider washing too much of their outdoor-sport load at 30 degrees. If you have been sweating, then bacteria will be now in your garments (recognised by the smell). A 30 deg wash will just move this bacteria around & encourage more growth; a 40 deg wash will do a better job of killing it off (as that is above your body temperature), but more will be killed by a 70 deg wash
In might seem un-carbon-friendly, but the other result is to have further problems (plus the wash will not be as effective in getting rid of the dirt)
Keep up the good work!