Occidental invested in Carbon Engineering alongside Chevron in early 2019, pledging to accelerate commercialization of the start-up's technology. In the intervening years, however, outside factors threatened to derail the whole project. That includes Oxy's $55 billion acquisition of Anadarko Petroleum that sunk the company's stock and incurred the wrath of activist investor Carl Icahn. Hollub survived calls for her resignation, only for Covid-19 and plunging oil prices to hammer the company's stock once again in 2020. Through it all, Hollub stuck with her commitment to carbon capture. Occidental became the first U.S. oil company to lay out an "ambition" to become fully net zero by 2050, including customer emissions. That put it ahead of U.S. peers like Exxon, Chevron and ConocoPhillips, which have so far declined such measures. Occidental's talk of zeroing-out emissions in 2020 came alongside a pledge to build the world's largest DAC plant in the Permian Basin, using Carbon Engineering's technology.