Hong Kong’s wealthiest man, Li Ka-shing, once the majority shareholder of a Canadian oil company, has been steering his investments towards climate change and sustainability.His particular focus of late has been the development of environmentally friendly hydrogen-electric engines.Through its private investment arm, Li’s Horizons Ventures led a US$23 million round of Series B financing in Houston-based Syzygy Plasmonics, a start-up that has developed a hydrogen fuel-cell technology that…