Australian tech billionaire and climate activist Mike Cannon-Brookes has defended his company’s sponsorship of the Williams Formula 1 team and his use of a private jet, emphasizing the need for pragmatic trade-offs in the pursuit of sustainability.

“Striking the balance between pragmatism and ambition is hard,” Cannon-Brookes, the cofounder and CEO of collaboration software company Atlassian, said in a LinkedIn post on Thursday. “And we know climate isn’t a zero-sum game.”

Addressing concerns over Atlassian’s partnership with Williams Racing, he recognized the irony of sponsoring a fuel-intensive sport while advocating for sustainability and expressed confidence in Formula 1’s commitment to achieving net zero emissions by 2030.

He noted that the FIA, the sport’s governing body, has demonstrated ongoing efforts toward sustainability, highlighting that from next year, F1 cars will be half-powered by electric motors and run on sustainable fuel. “F1 can set a global example for sustainability in sports—and I believe it will,” Cannon-Brookes said.

Last month, Atlassian announced a major partnership with Britain’s Williams Racing, marking the biggest deal in the team’s 48-year history. Though financial details were not disclosed, the struggling F1 team—which finished 9th out of 10 in last year’s rankings—will now compete under the name Atlassian Williams Racing. The season opener for F1 will begin in Melbourne, Australia this weekend.

Cannon-Brookes also addressed criticism of his private jet use, admitting to a deep internal conflict on the issue. While acknowledging that private aviation is a carbon-intensive mode of travel, he said he needs it for personal security and family commitments.

The billionaire has reportedly acquired a Bombardier Global 7500, a long-range private jet capable of flying from Sydney to Detroit in a single trip. With the jet, “I can run a global business from Australia, and still be a constantly present dad,” Cannon-Brookes said.

Cannon-Brookes has a net worth of $13.9 billion according to Forbes’ real-time data. Through his private investment vehicle Grok Ventures, he has been increasing his investments in renewable energy and funding philanthropic efforts to combat climate change. One of his companies, Sun Cable, is building the A$30-billion ($20 billion) undersea cable that will deliver solar-generated electricity from Darwin to Singapore.