Our technology works and is extremely effective in creating negative emissions and taking back the carbon dioxide that has been released into the atmosphere for decades. If we build 40,000 DAC units, each of which takes back one million tonnes of carbon dioxide per year, we could take back as much carbon dioxide as is released into the atmosphere each year . According to the research community, the goal is to return to an atmospheric carbon dioxide concentration of 350 ppm. This was already passed in 1990 and this corresponds to an amount of about 870 billion tonnes of carbon dioxide that must be removed over time.