To transit towards an environmentally sustainable society, sustainable entrepreneurs need funding from external parties. Crowdfunding can provide a good alternative for financing sustainable initiatives. To further understand this emerging phenomenon, a case study approach is adopted to analyze sustainable crowdfunding by exploring the motivation, the platform, the return on investment, and the relationship between creator and backers. Four successfully crowdfunded sustainable projects from the reward-based platform Kickstarter were chosen to represent different industries and crowdfunding models.