Billionaire Atlassian co-founder Mike Cannon-Brookes says he is personally conflicted about owning a private jet, arguing it is needed for his safety and he is offsetting the emissions from his carbon-intensive travel.

Cannon-Brookes is one of the country’s most outspoken supporters of cutting carbon emissions, using his vehicle, Grok Ventures, to campaign for AGL Energy, where he is the largest investor, to accelerate the closure of coal power plants. He has also pushed other companies to lower emissions, and is invested in Sun Cable, a major solar power project near Darwin.