evidence: These conversations showed me that climate sceptics are not always angry, or selfish. They’re also not always necessarily wrong, if you listen to the ones with thoughtful reflections or suggestions about the science, even if they sometimes word them rather strongly. [...] I do still have anonymous climate sceptics, often from overseas, replying to something I’ve said on Twitter with some variation on the idea that climate change is completely natural. Yes, sometimes they are angry, and they are definitely wrong. Occasionally I also hear people argue the opposite – that every change we see in our climate and weather is our fault. [...] So climate change is both human and natural. And human influences on climate are both warming and cooling. But our best estimate for that balance right now is that all the warming since 1951 has been caused by humans.