CANNES, France — Ahead of the Cannes Film Festival premiere of their latest movie Groundswell, award-winning documentary filmmakers Josh Tickell and Rebecca Harrell Tickell announce the launch of One Billion Acres, a landmark campaign to accelerate the worldwide transition to regenerative agriculture. Coffee brand Nespresso becomes the first company to sign the pledge. The announcement arrives at a pivotal moment. Tickell and Harrell Tickell’s l…