When the global shutdown eases and things return to "normal", business as usual may not be an option.
When thousands gathered at Sydney's Town Hall in January 2020 to demand action on climate change, they couldn't have conceived of the different sort of crisis that was looming. Cole Bennetts
Near the top of the Mauna Loa volcano in Hawaii, 3400m above sea level, a gleaming observatory surrounded by dark lava rocks measures carbon dioxide levels every second of every day.
It was here, using this data, that chemist Charles Keeling first demonstrated that the impact of fossil fuel use on atmospheric carbon dioxide levels was measurable. The result of his research, known as the "Keeling curve", shows how concentrations of carbon dioxide in the atmosphere have been ticking up since records began in 1958.
