If you stepped into an elevator and had 2 minutes to explain some aspect of climate science to someone, could you do it? Most people lack the time to become fully informed on this critical issue. The science is complex and varied. Here are 28 quick pitches to help you better understand this issue which we should all be concerned about. Chapters 01 ancient sunlight 02 radiative gases 03 the greenhouse effect 04 the carbon cycle 05 the climate system 06 condensing and non-condensing gases 07 trace gases 08 solar irradiance 09 volcanoes 10 silicate rock weathering 11 rising CO2 concentrations 12 tipping points 13 geological evidence of CO2 effects 14 glacial-interglacial cycles 15 temperature data sets 16 temperature reconstructions 17 extreme weather 18 tropospheric hot spot 19 ocean warming 20 sea level rise 21 ocean acidification 22 permafrost and methane clathrates 23 polar amplification 24 glaciers 25 greenland ice sheet 26 arctic sea ice 27 antarctic sea ice 28 antarctic continental ice sheets