One of the easiest things you can do is to switch your energy supplier to one that generates sustainable energy for you, rather than one that invests in outdated, dirty fossil fuels, like fracking.

The best, most truly renewable energy suppliers are Ecotricity and Good Energy.  Their electricity is 100% from renewables.  Beware of other ‘green’ energy tariffs, which may not be as green as their marketing makes out.