In an empty parking lot somewhere in northern California, Andrew Song and Luke Iseman inflate a balloon the size of a small car, full of sulfur dioxide. They will then launch the balloon high up into the stratosphere where it will pop, releasing its sulfur dioxide contents.&nbsp;Song and Iseman are the co-founders of Make Sunsets, a geoengineering startup that sells cooling credits. For a price, you can purchase a bit of the sulfur dioxide they’re pumping into these balloons and launching into the stratosphere, with the belief it will offset the warming effects of CO2.&nbsp;Because if you send enough sulfur dioxide into the stratosphere --- we’re talking a million tonnes a year --- it’ll significantly cool our warming planet. But the idea raises scores of complicated scientific and moral dilemmas.&nbsp;In this documentary, John Chipman goes to California to learn about the potential risks and benefits of solar geoengineering.&nbsp;Reported and produced by John Chipman, with assistance from Joan Webber and Catherine Rolfsen. Mixed by Michelle Parise . It originally aired on What on Earth.&nbsp;Storylines is part of the <a href="https://www.cbc.ca/radio/audiodocs" rel="noopener noreferrer" target="_blank">CBC Audio Doc Unit </a>

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Can solar geoengineering fix the climate?

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