Telegraph: I became aware of climate change and its possible causes about a decade ago, when talk of melting ice caps prompted concerns about coastal flooding and the demise of polar bears. I bought a wind-up radio and started recycling. But it wasn’t until 2006, when reports on global warming and its effects started coming thick and fast, that the imperative to do my bit hit home. But where to start and what to do? Reducing carbon emissions from our homes, which account for 27 per cent of the …