You're not debating if climate change is real, because it most certainly is. The climate constantly changes naturally. You are debating if it's man made or not. Which, actually, it also is, by HAARP, cloud seeding, radio transmission and other weather modifications carried out by the government and NGO research corporations and universities. If they say you are being conspiratorial, isn't it the same to be if we believe our "emissions" could even put a dent into the earths atmosphere, as it is to believe that they are manipulating it themselves? That should stop the argument. Better yet, ask them if they believe that universities are breeding new species of insects (which they are), and how that affects the "climate", because it does.