Global environmental issues

There where three factors that caused the human impact on earth's ecological system. The first was the explosion of human numbers, the population of human quadruple in one single century. Second, was the ability for humans to tap the energy potential fossil fuels which then cause humans to make new resources. Lastly, the contribution to environmental transformation caused an economic growth because with science the production of goods increased. Because of these factors many forest and grasslands where used as cropland which meant that many of plants and animals began to disappear. This was not the only problem because then came pollution in many cities which killed around 35,000 people every year.
In the first half of the twentieth century people began to be aware that they needed to preserve land form human disruption. It was not until the second half of the twentieth century that people began to respond. In the early 1990s around 14 million Americans began to join environmental organizations, because they where scared that the contamination would threaten their lives, animals, and plants. Many movements began to happen when companies wanted changes in political and social structure of their countries. Because of all the environmental problem happening in the late twentieth century businesses where pushed into a "green" direction. And people had to alter their way of life.