ipc

Vaclav Smil's talk on historic energy transitions and what they imply for climate investment. He argues that transitions are slow, technology improves gradually, and only absolute cuts in energy use would truly work.

Carl Sagan's December 1985 testimony to Congress on the greenhouse effect, about 15 minutes long. He lays out CO2 warming, the risk of runaway effects and the danger of continued coal burning.

Elon Musk gives students at the Sorbonne a short, simple explanation of climate change and carbon emissions shortly before the 2015 COP21 conference in Paris. He covers why CO2 accumulation matters and argues for a carbon tax.