Cutting your fuel use will also help to limit emissions of harmful gases - both carbon dioxide (the major contributor to climate change) and nitrogen dioxide, a serious hazard to human health.
Avoid use of pesticides and weed killers in the garden - they can harm wildlife (including the natural pollinators) and pollute rivers and groundwater
Dispose of awkward things like household chemicals, cooking fats etc. with care - they can do serious environmental damage otherwise. For advice see Wiltshire Council's recycling information.