Sustain.Life, a climate tech start-up co-founded by Irish entrepreneur Mike Hanrahan, has been acquired by listed US software company Workiva in a deal worth around $100 million (€93.1 million), The Currency understands. The New Jersey-based startup, which was set up by Hanrahan alongside three former Walmart executives less than three years ago, enables businesses to measure their carbon footprint and makes suggestions on how to reduce their emissions. Sustain.Life employs over 50 people, almost a third of whom are based between Ireland and the UK. It had raised around $20 million from a smattering of investors that included Dutch firm…