In this clip from "The Court of Public Opinion," LIVE edition, Jeremy Cordeaux interviews Professor Ian Plimer about various scientific and environmental topics. Here’s a summary of the main topics discussed:

• Black Holes: Discussion on the discovery of a black hole 20,000 times bigger than the sun and the physics behind black holes.
• Supernova Eruptions: Historical records and significance of supernova eruptions.
• Search for Extraterrestrial Life: Using light from distant stars and exoplanets to search for signs of oxygen and potential life.
• Mpemba Effect: The phenomenon where hot water can freeze faster than cold water.
• Toxic Substances in Tampons: Discovery of arsenic, heavy metals, and other toxic substances in tampons.
• Arsenic and Lead Poisoning: Discussion on the cumulative effects of arsenic and lead, historical uses, and detection methods.
• Mercury Toxicity: Dangers of mercury poisoning, historical cases, and personal anecdotes from mercury mines.
• Microplastics: The prevalence of microplastics in everyday items and their potential health risks.
• Volcanic Emissions: The significant amount of carbon dioxide emitted by submarine volcanoes and its impact on climate.
• Critique of Climate Policies: Criticism of the focus on reducing human carbon emissions while ignoring natural sources like volcanoes.