Environmental protection aims to prevent unwanted changes to ecosystems from human activities. The rate of industrialization increased rapidly during WWII, leading to intense environmental degradation. Rachel Carson's book Silent Spring in 1962 raised awareness of threats from pesticides like DDT. The Club of Rome's 1972 book Limits to Growth demonstrated that prevailing policies would lead to overshoot and collapse of human development. This sparked global discussions and led to the 1972 UN Stockholm Conference, establishing UNEP. The 1987 Brundtland Commission report Our Common Future defined sustainable development. Kenya passed the EMCA in 1999 to provide environmental guidelines and establish NEMA, the National Environment Complaints Committee, and the National Environment Tribunal to manage the environment.