Climate change poses clear, catastrophic threats. We may not agree on the extent, but we certainly can't afford the risk of inaction.
Good compost is key to thriving garden, it's zero-carbon (possibly even carbon-negative), free, and has positive ecological benefits.
Building up soil organic matter helps retain moisture and improve drainage, improves retention of nutrients, and even makes them more acessible to plant roots. Micro-fauna & flora populations are increased and these provide the basis of a rich food web where invertebrate numbers are boosted which provide meals for birds, hedgehogs and amphibians.