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27:59

We're living in a climate emergency. With the effects of the changing climate experienced worldwide, it's now widely recognized that we need to not only reduce emissions but actively remove carbon dioxide from the atmosphere - permanently.

Stephen Millburn, a physicist by training and entrepreneur by trade, is the founder of Nellie Technologies. The company uses the growth of micro-algae to remove carbon dioxide from the atmosphere through photosynthesis. The algae is grown in a specially designed photobioreactor, before being dried and turned into biochar through a process called pyrolysis. Biochar is a durable solid that locks away the carbon and can endure in soil for thousands of years.

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RAZOR's Reya El-Salahi also visits Carbon Unbound, one of the world's first summits dedicated to carbon dioxide removals, to find out more about the growing carbon removal market. The conference in London puts investors, buyers and policy makers together with bright young scientists and entrepreneurs who are staking our future on carbon dioxide removal.