But I'm going to focus on the heart of the problem, which is the fact that we still rely on dirty, carbon-based fuels for 85 percent of all the energy that our world burns every year.
但是，我会聚焦在问题的核心。 也就是事实上, 全世界每年有百分之85的能源 依然是靠燃烧肮脏的碳基燃料所产生。