Greenhouse gases have risen sharply since 1958, primarily due to the Industrial Revolution.Since the dawn of the Industrial Revolution, humans have increasingly been contributing unnatural sources of greenhouse gases into the system, causing the system to become unbalanced. The source of the carbon dioxide from humans have several reasons. In the first,Burning Fossil Fuels: burning coal to generate electricity, burning oil to power vehicles and aircraft (vehicle emissions), or burning wood in fires used for cooking or to provide heat, etc. changes the state of stored organic carbon from a liquid (e.g. oil) or solid (e.g. coal/wood) into a gas (carbon dioxide) which is released into the atmosphere.
Deforestation: vegetation absorbs carbon dioxide from the atmosphere during the process of photosynthesis, converting this to carbon which is stored within all plants (i.e it is a carbon sink). When vegetation is burned, this organic carbon is released into the atmosphere in the form of carbon dioxide, and in so doing becomes a carbon source rather than a carbon sink.