Australia, NSW, and Sydney are on fire! During the last month we are suffering the most dramatic bushfires in more than a decade. They are releasing plenty of smoke that is extremely dangerous for our health, and indeed Sydney has been the city with the most polluted air in the world these days. Is all of this a consequence of climate change? In this episode our Skyentists, astronomers Ángel López-Sánchez and Kirsten Banks, talk about global warming, climate change and the huge difficulty to properly comprehend all these issues. They also summarise the recent white paper "The imperative to reduce carbon emissions in astronomy" by Stevens et al 2019, that is available in https://arxiv.org/abs/1912.05834 . The plot "how global warming stacks up" provided by NASA that they discuss today can be obtained in https://svs.gsfc.nasa.gov/30615 . For "Space News" Ángel talks about the dimming of bright red super-giant star Betelgeuse and Kirsten talks (again) about SpaceX's Starlink satellites. She panicked after watching a new simulation of planned 12,000 Starlink satellites which will be visible during a summer night (it is here: https://www.youtube.com/watch?v=LGBuk2BTvJE ). For "What's Up!" they talk about bright Southern star Achernar. Kirsten also provides some ideas about "astronomical gifts for Christmas". In addition to Kirsten and Ángel, there are two extra voices on this episode, but you have to listen to all of it to know who they are.