Scoop litter from canals. Volunteer on an urban farm. Use a bike to get around. As a perk for climate-friendly actions, visitors to Copenhagen are being offered rewards like free ice cream, a glass of wine and museum discounts. Could programs like this make tourism more sustainable? Also, we’ll hear more about the mixed signals the economy is giving and Delta passengers’ class-action lawsuit over compensation for last month’s CrowdStrike travel fiasco.