Heavy rain in October? Even in Mumbai, we see extreme weather events growing both in number and intensity. Ah, this is due to "global warming" or "climate change"... But, what is climate? What is the greenhouse effect? If climate varied naturally in the past, how do we know that humans are disrupting climate now? Why do increases in global warming matter for the world? Join us at Chai and Why? as we look at some basic scientific issues underlying climate change.