History Of Global Warming

It was not until the 20th century that the scientists discovered the climatic changes. People long expected that human activity would bring the climatic changes e.g. cutting down the forests, disposing waste in the rivers and lakes, burning processes in huge industries etc. All these had damaged the ozone layer and thus resulted in global warming.
In late 20th century United States, North Atlantic and other regions began to warm. At first the process was at lower pace but then, with rapid industrialization and cutting down of forest, this process accelerated. Now it has reached up to an alarming level which involves the risk of catastrophe and devastation.