Zelda Bentham, head of environment and climate change [of] Aviva [says the company has been]...carbon neutral since 2006 for [its] operational emissions. "Initially, our projects were focused around things like renewable energy, but over time we've integrated these with our social investment work. It makes sense for us. Our business is helping our customers make provision for the future, whether that's through long-term savings or through life and general insurance...As well as the social benefits it delivers, we find that a "carbon-for-development" approach to offsetting goes down particularly well with our employees...[but] a big challenge is around measuring project benefits – especially on the social side"