George H.W. Bush, who pledged to be 'the environmental president,' took a market-based approach to pollution control that helped clear the air. Now some experts think it could work on climate change.
The merchant navy – some 20,000 ships – carries the vast majority of trade goods around the world. Unfortunately, they also spew toxic pollutants that harm people and the environment.
A century before the modern environmental era, experts realized that London's dirty air was corroding its new Parliament building. This insight led to some of the first air pollution laws.